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)
 			{
@@ -9536,25 +9540,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13831,22 +13842,38 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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)
+	{
+		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

@@ -1426,19 +1426,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9539,25 +9543,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13834,22 +13845,38 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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)
+	{
+		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

@@ -1432,19 +1432,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9541,25 +9545,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13837,22 +13848,38 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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)
+	{
+		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

@@ -1432,19 +1432,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9555,25 +9559,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13832,22 +13843,38 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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)
+	{
+		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

@@ -1432,19 +1432,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9580,25 +9584,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13874,17 +13885,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -13892,6 +13916,9 @@ public class Player extends Playable
 				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

@@ -1534,19 +1534,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9593,25 +9597,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13890,17 +13901,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -13908,6 +13932,9 @@ public class Player extends Playable
 				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

@@ -1616,19 +1616,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9594,25 +9598,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13896,17 +13907,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -13914,6 +13938,9 @@ public class Player extends Playable
 				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

@@ -1616,19 +1616,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9609,25 +9613,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13932,17 +13943,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -13950,6 +13974,9 @@ public class Player extends Playable
 				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

@@ -1610,19 +1610,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9711,25 +9715,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -14048,17 +14059,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -14066,6 +14090,9 @@ public class Player extends Playable
 				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

@@ -1592,19 +1592,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9737,25 +9741,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -14086,17 +14097,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -14104,6 +14128,9 @@ public class Player extends Playable
 				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

@@ -1592,19 +1592,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9787,25 +9791,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -14148,17 +14159,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -14166,6 +14190,9 @@ public class Player extends Playable
 				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

@@ -1603,19 +1603,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9815,25 +9819,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -14176,17 +14187,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -14194,6 +14218,9 @@ public class Player extends Playable
 				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

@@ -1603,19 +1603,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9440,25 +9444,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13648,25 +13659,38 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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)
+	{
+		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

@@ -1434,19 +1434,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9440,25 +9444,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13648,25 +13659,38 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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)
+	{
+		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

@@ -1434,19 +1434,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9426,25 +9430,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13634,17 +13645,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -13652,6 +13676,9 @@ public class Player extends Playable
 				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

@@ -1536,19 +1536,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9466,25 +9470,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13695,17 +13706,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -13713,6 +13737,9 @@ public class Player extends Playable
 				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

@@ -1618,19 +1618,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9466,25 +9470,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13695,17 +13706,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -13713,6 +13737,9 @@ public class Player extends Playable
 				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

@@ -1618,19 +1618,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9420,25 +9424,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13705,17 +13716,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -13723,6 +13747,9 @@ public class Player extends Playable
 				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

@@ -1612,19 +1612,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9428,25 +9432,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13644,25 +13655,38 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	/**
-	 * @param iu
-	 */
 	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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)
+	{
+		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

@@ -1426,19 +1426,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9585,25 +9589,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -13976,14 +13987,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	public void sendInventoryUpdate(IClientOutgoingPacket iu)
+	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -13991,6 +14018,9 @@ public class Player extends Playable
 				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

@@ -1720,19 +1720,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9652,25 +9656,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -14070,14 +14081,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	public void sendInventoryUpdate(IClientOutgoingPacket iu)
+	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -14085,6 +14112,9 @@ public class Player extends Playable
 				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

@@ -1729,19 +1729,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9832,25 +9836,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -14250,14 +14261,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	public void sendInventoryUpdate(IClientOutgoingPacket iu)
+	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -14265,6 +14292,9 @@ public class Player extends Playable
 				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

@@ -1729,19 +1729,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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)
 			{
@@ -9882,25 +9886,32 @@ public class Player extends Playable
 	}
 	
 	public void sendSkillList(int lastLearnedSkillId)
+	{
+		if (_skillListTask == null)
+		{
+			_skillListTask = ThreadPool.schedule(() ->
 			{
 				boolean isDisabled = false;
-		final SkillList sl = new SkillList();
-		for (Skill s : getSkillList())
+				final SkillList skillList = new SkillList();
+				for (Skill skill : getSkillList())
 				{
 					if (_clan != null)
 					{
-				isDisabled = s.isClanSkill() && (_clan.getReputationScore() < 0);
+						isDisabled = skill.isClanSkill() && (_clan.getReputationScore() < 0);
 					}
 					
-			sl.addSkill(s.getDisplayId(), s.getReuseDelayGroup(), s.getDisplayLevel(), s.getSubLevel(), s.isPassive(), isDisabled, s.isEnchantable());
+					skillList.addSkill(skill.getDisplayId(), skill.getReuseDelayGroup(), skill.getDisplayLevel(), skill.getSubLevel(), skill.isPassive(), isDisabled, skill.isEnchantable());
 				}
 				if (lastLearnedSkillId > 0)
 				{
-			sl.setLastLearnedSkillId(lastLearnedSkillId);
+					skillList.setLastLearnedSkillId(lastLearnedSkillId);
 				}
-		sendPacket(sl);
 				
+				sendPacket(skillList);
 				sendPacket(new AcquireSkillList(this));
+				_skillListTask = null;
+			}, 300);
+		}
 	}
 	
 	/**
@@ -14331,14 +14342,30 @@ public class Player extends Playable
 		return _questZoneId;
 	}
 	
-	public void sendInventoryUpdate(IClientOutgoingPacket iu)
+	public void sendInventoryUpdate(InventoryUpdate iu)
 	{
-		sendPacket(iu);
+		_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()
+	{
+		if (_itemListTask == null)
+		{
+			_itemListTask = ThreadPool.schedule(() ->
 			{
 				sendPacket(new ItemList(1, this));
 				sendPacket(new ItemList(2, this));
@@ -14346,6 +14373,9 @@ public class Player extends Playable
 				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

@@ -1729,19 +1729,26 @@ public abstract class Inventory extends ItemContainer
 	 */
 	private void checkEquipTask()
 	{
-		if ((_skillItemTask == null) && (getOwner() != null) && getOwner().isPlayer() && getOwner().getActingPlayer().hasEnteredWorld())
+		if (_skillItemTask == null)
+		{
+			final Creature owner = getOwner();
+			if ((owner != null) && owner.isPlayer())
+			{
+				final Player player = owner.getActingPlayer();
+				if (player.hasEnteredWorld())
 				{
-			getOwner().getActingPlayer().setUsingSkillItem(true);
 					_skillItemTask = ThreadPool.schedule(() ->
 					{
-				getOwner().getActingPlayer().setUsingSkillItem(false);
-				getOwner().getStat().recalculateStats(true);
-				getOwner().updateAbnormalVisualEffects();
-				getOwner().getActingPlayer().sendSkillList();
+						player.setUsingSkillItem(false);
+						player.getStat().recalculateStats(true);
+						player.updateAbnormalVisualEffects();
+						player.sendSkillList();
 						_skillItemTask = null;
 					}, 50);
 				}
 			}
+		}
+	}
 	
 	/**
 	 * @return the mask of wore item

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;
+	}
 }