Addition of InventoryUpdate, ItemList and SkillList tasks.

L2J_Mobius_01.0_Ertheia/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -435,6 +435,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3726,8 +3731,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3736,7 +3740,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9537,24 +9541,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13831,22 +13842,38 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList(boolean open)
 	{
-		sendPacket(new ItemList(this, open));
-		sendPacket(new ExQuestItemList(this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(this, open));
+				sendPacket(new ExQuestItemList(this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_01.0_Ertheia/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1426,17 +1426,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_01.0_Ertheia/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_02.5_Underground/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -437,6 +437,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3728,8 +3733,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3738,7 +3742,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9540,24 +9544,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13834,22 +13845,38 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList(boolean open)
 	{
-		sendPacket(new ItemList(this, open));
-		sendPacket(new ExQuestItemList(this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(this, open));
+				sendPacket(new ExQuestItemList(this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_02.5_Underground/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1432,17 +1432,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_02.5_Underground/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_03.0_Helios/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -439,6 +439,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3730,8 +3735,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3740,7 +3744,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9542,24 +9546,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13837,22 +13848,38 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList(boolean open)
 	{
-		sendPacket(new ItemList(this, open));
-		sendPacket(new ExQuestItemList(this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(this, open));
+				sendPacket(new ExQuestItemList(this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_03.0_Helios/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1432,17 +1432,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_03.0_Helios/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_04.0_GrandCrusade/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -443,6 +443,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3726,8 +3731,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3736,7 +3740,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9556,24 +9560,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13832,22 +13843,38 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList(boolean open)
 	{
-		sendPacket(new ItemList(this, open));
-		sendPacket(new ExQuestItemList(this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(this, open));
+				sendPacket(new ExQuestItemList(this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_04.0_GrandCrusade/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1432,17 +1432,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_04.0_GrandCrusade/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_05.0_Salvation/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -441,6 +441,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3742,8 +3747,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3752,7 +3756,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9581,24 +9585,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13874,24 +13885,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_05.0_Salvation/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1534,17 +1534,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_05.0_Salvation/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_05.5_EtinasFate/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -442,6 +442,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3755,8 +3760,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3765,7 +3769,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9594,24 +9598,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13890,24 +13901,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_05.5_EtinasFate/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1616,17 +1616,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_05.5_EtinasFate/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_06.0_Fafurion/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -442,6 +442,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3756,8 +3761,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3766,7 +3770,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9595,24 +9599,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13896,24 +13907,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_06.0_Fafurion/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1616,17 +1616,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_06.0_Fafurion/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_07.0_PreludeOfWar/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -454,6 +454,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3693,8 +3698,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3703,7 +3707,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9610,24 +9614,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13932,24 +13943,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_07.0_PreludeOfWar/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1610,17 +1610,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_07.0_PreludeOfWar/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_08.2_Homunculus/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -451,6 +451,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3724,8 +3729,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3734,7 +3738,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9712,24 +9716,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -14048,24 +14059,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_08.2_Homunculus/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1592,17 +1592,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_08.2_Homunculus/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_09.2_ReturnOfTheQueenAnt/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -464,6 +464,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3741,8 +3746,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3751,7 +3755,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9738,24 +9742,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -14086,24 +14097,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_09.2_ReturnOfTheQueenAnt/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1592,17 +1592,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_09.2_ReturnOfTheQueenAnt/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_10.1_MasterClass/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -465,6 +465,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3762,8 +3767,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3772,7 +3776,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9788,24 +9792,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -14148,24 +14159,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_10.1_MasterClass/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1603,17 +1603,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_10.1_MasterClass/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -465,6 +465,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3790,8 +3795,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3800,7 +3804,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9816,24 +9820,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -14176,24 +14187,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1603,17 +1603,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_Classic_2.0_Saviors/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -439,6 +439,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3705,8 +3710,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3715,7 +3719,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9441,24 +9445,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13648,25 +13659,38 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
-	/**
-	 * @param open
-	 */
 	public void sendItemList(boolean open)
 	{
-		sendPacket(new ItemList(this, open));
-		sendPacket(new ExQuestItemList(this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(this, open));
+				sendPacket(new ExQuestItemList(this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_Classic_2.0_Saviors/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1434,17 +1434,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_Classic_2.0_Saviors/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_Classic_2.1_Zaken/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -439,6 +439,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3705,8 +3710,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3715,7 +3719,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9441,24 +9445,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13648,25 +13659,38 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
-	/**
-	 * @param open
-	 */
 	public void sendItemList(boolean open)
 	{
-		sendPacket(new ItemList(this, open));
-		sendPacket(new ExQuestItemList(this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(this, open));
+				sendPacket(new ExQuestItemList(this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_Classic_2.1_Zaken/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1434,17 +1434,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_Classic_2.1_Zaken/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_Classic_2.2_Antharas/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -437,6 +437,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3689,8 +3694,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3699,7 +3703,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9427,24 +9431,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13634,24 +13645,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_Classic_2.2_Antharas/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1536,17 +1536,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_Classic_2.2_Antharas/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_Classic_2.3_SevenSigns/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -446,6 +446,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3716,8 +3721,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3726,7 +3730,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9467,24 +9471,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13695,24 +13706,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_Classic_2.3_SevenSigns/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1618,17 +1618,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_Classic_2.3_SevenSigns/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_Classic_2.4_SecretOfEmpire/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -446,6 +446,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3716,8 +3721,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3726,7 +3730,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9467,24 +9471,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13695,24 +13706,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_Classic_2.4_SecretOfEmpire/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1618,17 +1618,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_Classic_2.4_SecretOfEmpire/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_Classic_3.0_TheKamael/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -460,6 +460,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3643,8 +3648,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3653,7 +3657,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9421,24 +9425,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13705,24 +13716,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_Classic_3.0_TheKamael/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1612,17 +1612,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_Classic_3.0_TheKamael/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_Classic_Interlude/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -434,6 +434,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3686,8 +3691,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3696,7 +3700,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9429,24 +9433,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13644,25 +13655,38 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
-	/**
-	 * @param open
-	 */
 	public void sendItemList(boolean open)
 	{
-		sendPacket(new ItemList(this, open));
-		sendPacket(new ExQuestItemList(this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(this, open));
+				sendPacket(new ExQuestItemList(this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_Classic_Interlude/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1426,17 +1426,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_Classic_Interlude/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_Essence_4.2_DwellingOfSpirits/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -470,6 +470,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3724,8 +3729,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3734,7 +3738,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9586,24 +9590,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -13976,21 +13987,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	public void sendInventoryUpdate(IClientOutgoingPacket iu)
+	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_Essence_4.2_DwellingOfSpirits/java/org/l2jmobius/gameserver/model/actor/Summon.java

@@ -73,6 +73,7 @@ import org.l2jmobius.gameserver.network.serverpackets.pet.ExPetInfo;
 import org.l2jmobius.gameserver.network.serverpackets.pet.ExPetSkillList;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetDelete;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetInfo;
+import org.l2jmobius.gameserver.network.serverpackets.pet.PetInventoryUpdate;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetItemList;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetStatusUpdate;
 import org.l2jmobius.gameserver.taskmanager.DecayTaskManager;
@@ -1145,12 +1146,12 @@ public abstract class Summon extends Playable
 		return _summonPoints;
 	}
 	
-	public void sendInventoryUpdate(IClientOutgoingPacket iu)
+	public void sendInventoryUpdate(PetInventoryUpdate iu)
 	{
 		final Player owner = _owner;
 		if (owner != null)
 		{
-			owner.sendInventoryUpdate(iu);
+			owner.sendPacket(iu);
 			if (getInventory() != null)
 			{
 				owner.sendPacket(new PetItemList(getInventory().getItems()));

L2J_Mobius_Essence_4.2_DwellingOfSpirits/java/org/l2jmobius/gameserver/model/actor/instance/Pet.java

@@ -870,7 +870,7 @@ public class Pet extends Summon
 		{
 			final InventoryUpdate iu = new InventoryUpdate();
 			iu.addModifiedItem(newItem);
-			sendInventoryUpdate(iu);
+			getOwner().sendInventoryUpdate(iu);
 		}
 		
 		return newItem;
@@ -1531,7 +1531,7 @@ public class Pet extends Summon
 				controlItem.updateDatabase();
 				final InventoryUpdate iu = new InventoryUpdate();
 				iu.addModifiedItem(controlItem);
-				sendInventoryUpdate(iu);
+				getOwner().sendInventoryUpdate(iu);
 			}
 		}
 		else
@@ -1677,9 +1677,9 @@ public class Pet extends Summon
 			}
 		}
 		
-		final PetInventoryUpdate petUI = new PetInventoryUpdate();
-		petUI.addItems(items);
-		sendInventoryUpdate(petUI);
+		final PetInventoryUpdate petIU = new PetInventoryUpdate();
+		petIU.addItems(items);
+		sendInventoryUpdate(petIU);
 		getStat().recalculateStats(true);
 		if (abortAttack)
 		{

L2J_Mobius_Essence_4.2_DwellingOfSpirits/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1720,17 +1720,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_Essence_4.2_DwellingOfSpirits/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_Essence_5.2_FrostLord/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -494,6 +494,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3766,8 +3771,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3776,7 +3780,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9653,24 +9657,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -14070,21 +14081,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	public void sendInventoryUpdate(IClientOutgoingPacket iu)
+	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_Essence_5.2_FrostLord/java/org/l2jmobius/gameserver/model/actor/Summon.java

@@ -73,6 +73,7 @@ import org.l2jmobius.gameserver.network.serverpackets.pet.ExPetInfo;
 import org.l2jmobius.gameserver.network.serverpackets.pet.ExPetSkillList;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetDelete;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetInfo;
+import org.l2jmobius.gameserver.network.serverpackets.pet.PetInventoryUpdate;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetItemList;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetStatusUpdate;
 import org.l2jmobius.gameserver.taskmanager.DecayTaskManager;
@@ -1145,12 +1146,12 @@ public abstract class Summon extends Playable
 		return _summonPoints;
 	}
 	
-	public void sendInventoryUpdate(IClientOutgoingPacket iu)
+	public void sendInventoryUpdate(PetInventoryUpdate iu)
 	{
 		final Player owner = _owner;
 		if (owner != null)
 		{
-			owner.sendInventoryUpdate(iu);
+			owner.sendPacket(iu);
 			if (getInventory() != null)
 			{
 				owner.sendPacket(new PetItemList(getInventory().getItems()));

L2J_Mobius_Essence_5.2_FrostLord/java/org/l2jmobius/gameserver/model/actor/instance/Pet.java

@@ -870,7 +870,7 @@ public class Pet extends Summon
 		{
 			final InventoryUpdate iu = new InventoryUpdate();
 			iu.addModifiedItem(newItem);
-			sendInventoryUpdate(iu);
+			getOwner().sendInventoryUpdate(iu);
 		}
 		
 		return newItem;
@@ -1531,7 +1531,7 @@ public class Pet extends Summon
 				controlItem.updateDatabase();
 				final InventoryUpdate iu = new InventoryUpdate();
 				iu.addModifiedItem(controlItem);
-				sendInventoryUpdate(iu);
+				getOwner().sendInventoryUpdate(iu);
 			}
 		}
 		else
@@ -1677,9 +1677,9 @@ public class Pet extends Summon
 			}
 		}
 		
-		final PetInventoryUpdate petUI = new PetInventoryUpdate();
-		petUI.addItems(items);
-		sendInventoryUpdate(petUI);
+		final PetInventoryUpdate petIU = new PetInventoryUpdate();
+		petIU.addItems(items);
+		sendInventoryUpdate(petIU);
 		getStat().recalculateStats(true);
 		if (abortAttack)
 		{

L2J_Mobius_Essence_5.2_FrostLord/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1729,17 +1729,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_Essence_5.2_FrostLord/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_Essence_6.1_BattleChronicle/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -498,6 +498,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3781,8 +3786,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3791,7 +3795,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9833,24 +9837,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -14250,21 +14261,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	public void sendInventoryUpdate(IClientOutgoingPacket iu)
+	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_Essence_6.1_BattleChronicle/java/org/l2jmobius/gameserver/model/actor/Summon.java

@@ -73,6 +73,7 @@ import org.l2jmobius.gameserver.network.serverpackets.pet.ExPetInfo;
 import org.l2jmobius.gameserver.network.serverpackets.pet.ExPetSkillList;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetDelete;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetInfo;
+import org.l2jmobius.gameserver.network.serverpackets.pet.PetInventoryUpdate;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetItemList;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetStatusUpdate;
 import org.l2jmobius.gameserver.taskmanager.DecayTaskManager;
@@ -1145,12 +1146,12 @@ public abstract class Summon extends Playable
 		return _summonPoints;
 	}
 	
-	public void sendInventoryUpdate(IClientOutgoingPacket iu)
+	public void sendInventoryUpdate(PetInventoryUpdate iu)
 	{
 		final Player owner = _owner;
 		if (owner != null)
 		{
-			owner.sendInventoryUpdate(iu);
+			owner.sendPacket(iu);
 			if (getInventory() != null)
 			{
 				owner.sendPacket(new PetItemList(getInventory().getItems()));

L2J_Mobius_Essence_6.1_BattleChronicle/java/org/l2jmobius/gameserver/model/actor/instance/Pet.java

@@ -870,7 +870,7 @@ public class Pet extends Summon
 		{
 			final InventoryUpdate iu = new InventoryUpdate();
 			iu.addModifiedItem(newItem);
-			sendInventoryUpdate(iu);
+			getOwner().sendInventoryUpdate(iu);
 		}
 		
 		return newItem;
@@ -1531,7 +1531,7 @@ public class Pet extends Summon
 				controlItem.updateDatabase();
 				final InventoryUpdate iu = new InventoryUpdate();
 				iu.addModifiedItem(controlItem);
-				sendInventoryUpdate(iu);
+				getOwner().sendInventoryUpdate(iu);
 			}
 		}
 		else
@@ -1677,9 +1677,9 @@ public class Pet extends Summon
 			}
 		}
 		
-		final PetInventoryUpdate petUI = new PetInventoryUpdate();
-		petUI.addItems(items);
-		sendInventoryUpdate(petUI);
+		final PetInventoryUpdate petIU = new PetInventoryUpdate();
+		petIU.addItems(items);
+		sendInventoryUpdate(petIU);
 		getStat().recalculateStats(true);
 		if (abortAttack)
 		{

L2J_Mobius_Essence_6.1_BattleChronicle/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1729,17 +1729,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_Essence_6.1_BattleChronicle/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }

L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/model/actor/Player.java

@@ -498,6 +498,11 @@ public class Player extends Playable
 	private long _lastAccess;
 	private long _uptime;
 	
+	private final Set<InventoryUpdate> _inventoryUpdates = ConcurrentHashMap.newKeySet(1);
+	private ScheduledFuture<?> _inventoryUpdateTask;
+	private ScheduledFuture<?> _itemListTask;
+	private ScheduledFuture<?> _skillListTask;
+	
 	private boolean _subclassLock = false;
 	protected int _baseClass;
 	protected int _activeClass;
@@ -3814,8 +3819,7 @@ public class Player extends Playable
 	 */
 	public boolean exchangeItemsById(String process, WorldObject reference, int coinId, long cost, int rewardId, long count, boolean sendMessage)
 	{
-		final PlayerInventory inv = _inventory;
-		if (!inv.validateCapacityByItemId(rewardId, count))
+		if (!_inventory.validateCapacityByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -3824,7 +3828,7 @@ public class Player extends Playable
 			return false;
 		}
 		
-		if (!inv.validateWeightByItemId(rewardId, count))
+		if (!_inventory.validateWeightByItemId(rewardId, count))
 		{
 			if (sendMessage)
 			{
@@ -9883,24 +9887,31 @@ public class Player extends Playable
 	
 	public void sendSkillList(int lastLearnedSkillId)
 	{
-		boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+		if (_skillListTask == null)
 		{
-			if (_clan != null)
+			_skillListTask = ThreadPool.schedule(() ->
 			{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
-			}
-			
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+				boolean isDisabled = false;
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
+				{
+					if (_clan != null)
+					{
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
+					}
+					
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
+				}
+				if (lastLearnedSkillId > 0)
+				{
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
+				}
+				
+				sendPacket(skillList);
+				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
 		}
-		if (lastLearnedSkillId > 0)
-		{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
-		}
-		sendPacket(sl);
-		
-		sendPacket(new AcquireSkillList(this));
 	}
 	
 	/**
@@ -14331,21 +14342,40 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	public void sendInventoryUpdate(IClientOutgoingPacket iu)
+	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		_inventoryUpdates.add(iu);
+		if (_inventoryUpdateTask == null)
+		{
+			_inventoryUpdateTask = ThreadPool.schedule(() ->
+			{
+				for (InventoryUpdate packet : _inventoryUpdates)
+				{
+					sendPacket(packet);
+					_inventoryUpdates.remove(packet);
+				}
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_inventoryUpdateTask = null;
+			}, 300);
+		}
 	}
 	
 	public void sendItemList()
 	{
-		sendPacket(new ItemList(1, this));
-		sendPacket(new ItemList(2, this));
-		sendPacket(new ExQuestItemList(1, this));
-		sendPacket(new ExQuestItemList(2, this));
-		sendPacket(new ExAdenaInvenCount(this));
-		sendPacket(new ExUserInfoInvenWeight(this));
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
+			{
+				sendPacket(new ItemList(1, this));
+				sendPacket(new ItemList(2, this));
+				sendPacket(new ExQuestItemList(1, this));
+				sendPacket(new ExQuestItemList(2, this));
+				sendPacket(new ExAdenaInvenCount(this));
+				sendPacket(new ExUserInfoInvenWeight(this));
+				_itemListTask = null;
+			}, 300);
+		}
 	}
 	
 	public Fishing getFishing()

L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/model/actor/Summon.java

@@ -73,6 +73,7 @@ import org.l2jmobius.gameserver.network.serverpackets.pet.ExPetInfo;
 import org.l2jmobius.gameserver.network.serverpackets.pet.ExPetSkillList;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetDelete;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetInfo;
+import org.l2jmobius.gameserver.network.serverpackets.pet.PetInventoryUpdate;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetItemList;
 import org.l2jmobius.gameserver.network.serverpackets.pet.PetStatusUpdate;
 import org.l2jmobius.gameserver.taskmanager.DecayTaskManager;
@@ -1145,12 +1146,12 @@ public abstract class Summon extends Playable
 		return _summonPoints;
 	}
 	
-	public void sendInventoryUpdate(IClientOutgoingPacket iu)
+	public void sendInventoryUpdate(PetInventoryUpdate iu)
 	{
 		final Player owner = _owner;
 		if (owner != null)
 		{
-			owner.sendInventoryUpdate(iu);
+			owner.sendPacket(iu);
 			if (getInventory() != null)
 			{
 				owner.sendPacket(new PetItemList(getInventory().getItems()));

L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/model/actor/instance/Pet.java

@@ -870,7 +870,7 @@ public class Pet extends Summon
 		{
 			final InventoryUpdate iu = new InventoryUpdate();
 			iu.addModifiedItem(newItem);
-			sendInventoryUpdate(iu);
+			getOwner().sendInventoryUpdate(iu);
 		}
 		
 		return newItem;
@@ -1531,7 +1531,7 @@ public class Pet extends Summon
 				controlItem.updateDatabase();
 				final InventoryUpdate iu = new InventoryUpdate();
 				iu.addModifiedItem(controlItem);
-				sendInventoryUpdate(iu);
+				getOwner().sendInventoryUpdate(iu);
 			}
 		}
 		else
@@ -1677,9 +1677,9 @@ public class Pet extends Summon
 			}
 		}
 		
-		final PetInventoryUpdate petUI = new PetInventoryUpdate();
-		petUI.addItems(items);
-		sendInventoryUpdate(petUI);
+		final PetInventoryUpdate petIU = new PetInventoryUpdate();
+		petIU.addItems(items);
+		sendInventoryUpdate(petIU);
 		getStat().recalculateStats(true);
 		if (abortAttack)
 		{

L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -1729,17 +1729,24 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
 		{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
-			_skillItemTask = ThreadPool.schedule(() ->
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
 			{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
-				_skillItemTask = null;
-			}, 50);
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
+				{
+					_skillItemTask = ThreadPool.schedule(() ->
+					{
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
+						_skillItemTask = null;
+					}, 50);
+				}
+			}
 		}
 	}
 	

L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/network/serverpackets/InventoryUpdate.java

@@ -49,4 +49,15 @@ public class InventoryUpdate extends AbstractInventoryUpdate
 		writeItems(packet);
 		return true;
 	}
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (obj instanceof InventoryUpdate)
+		{
+			final InventoryUpdate iu = (InventoryUpdate) obj;
+			return getItems().equals(iu.getItems());
+		}
+		return false;
+	}
 }