diff --git a/L2BotCore/Domain/Entities/Drop.h b/L2BotCore/Domain/Entities/Drop.h
index 53de08e..250a969 100644
--- a/L2BotCore/Domain/Entities/Drop.h
+++ b/L2BotCore/Domain/Entities/Drop.h
@@ -52,8 +52,8 @@ namespace L2Bot::Domain::Entities
 			const ValueObjects::Transform transform,
 			const uint32_t itemId,
 			const uint32_t amount,
-			const std::string name,
-			const std::string iconName
+			const std::string& name,
+			const std::string& iconName
 		) :
 			WorldObject(id, transform),
 			m_ItemId(itemId),
diff --git a/L2BotCore/Domain/Serializers/Node.h b/L2BotCore/Domain/Serializers/Node.h
index 292a0ea..1251469 100644
--- a/L2BotCore/Domain/Serializers/Node.h
+++ b/L2BotCore/Domain/Serializers/Node.h
@@ -14,11 +14,11 @@ namespace L2Bot::Domain::Serializers
 		const bool isContainer = false;
 
 		Node() = delete;
-		Node(const std::string name, const std::string value) :
+		Node(const std::string& name, const std::string& value) :
 			name(name), value(value)
 		{
 		}
-		Node(const std::string name, const std::vector<Node> children, const bool isArray = false) :
+		Node(const std::string& name, const std::vector<Node> children, const bool isArray = false) :
 			name(name), children(children), isArray(isArray), isContainer(true)
 		{
 		}
diff --git a/L2BotCore/Domain/Serializers/SerializableStateContainer.h b/L2BotCore/Domain/Serializers/SerializableStateContainer.h
index fe4ec94..b53db33 100644
--- a/L2BotCore/Domain/Serializers/SerializableStateContainer.h
+++ b/L2BotCore/Domain/Serializers/SerializableStateContainer.h
@@ -42,7 +42,7 @@ namespace L2Bot::Domain::Serializers
 			return result;
 		}
 
-		SerializableStateContainer(const std::vector<std::shared_ptr<DTO::EntityState>> objects, const std::string containerName) :
+		SerializableStateContainer(const std::vector<std::shared_ptr<DTO::EntityState>> objects, const std::string& containerName) :
 			m_Objects(objects), m_ContainerName(containerName)
 		{
 
diff --git a/L2BotCore/Domain/Transports/TransportInterface.h b/L2BotCore/Domain/Transports/TransportInterface.h
index 1f4ee79..a37a330 100644
--- a/L2BotCore/Domain/Transports/TransportInterface.h
+++ b/L2BotCore/Domain/Transports/TransportInterface.h
@@ -8,7 +8,7 @@ namespace L2Bot::Domain::Transports
 	public:
 		virtual const bool Connect() = 0;
 		virtual const bool IsConnected() const = 0;
-		virtual const void Send(std::string data) = 0;
+		virtual const void Send(const std::string& data) = 0;
 		virtual const std::string Receive() = 0;
 	};
 }
diff --git a/L2BotCore/Domain/ValueObjects/BaseItem.h b/L2BotCore/Domain/ValueObjects/BaseItem.h
index 126c9c0..cc25dc9 100644
--- a/L2BotCore/Domain/ValueObjects/BaseItem.h
+++ b/L2BotCore/Domain/ValueObjects/BaseItem.h
@@ -97,9 +97,9 @@ namespace L2Bot::Domain::ValueObjects
 			const bool isEquipped,
 			const uint16_t enchantLevel,
 			const int32_t mana,
-			const std::string name,
-			const std::string iconName,
-			const std::string description,
+			const std::string& name,
+			const std::string& iconName,
+			const std::string& description,
 			const uint16_t weight
 		) :
 			m_ItemId(itemId),
diff --git a/L2BotCore/Domain/ValueObjects/FullName.h b/L2BotCore/Domain/ValueObjects/FullName.h
index 4c727fb..758ea21 100644
--- a/L2BotCore/Domain/ValueObjects/FullName.h
+++ b/L2BotCore/Domain/ValueObjects/FullName.h
@@ -30,8 +30,8 @@ namespace L2Bot::Domain::ValueObjects
 		}
 
 		FullName(
-			const std::string nickname,
-			const std::string title
+			const std::string& nickname,
+			const std::string& title
 		) :
 			m_Nickname(nickname),
 			m_Title(title)
diff --git a/L2BotDll/Events/EventDispatcher.h b/L2BotDll/Events/EventDispatcher.h
index 272aa6e..ab36cf7 100644
--- a/L2BotDll/Events/EventDispatcher.h
+++ b/L2BotDll/Events/EventDispatcher.h
@@ -31,7 +31,7 @@ public:
 		}
 	}
 
-	void Subscribe(std::string eventName, Delegate handler)
+	void Subscribe(const std::string& eventName, const Delegate handler)
 	{
 		m_Handlers[eventName].push_back(handler);
 	}
diff --git a/L2BotDll/Transports/DebugViewTransport.h b/L2BotDll/Transports/DebugViewTransport.h
index 367c343..e716fa9 100644
--- a/L2BotDll/Transports/DebugViewTransport.h
+++ b/L2BotDll/Transports/DebugViewTransport.h
@@ -18,7 +18,7 @@ public:
 		return true;
 	}
 
-	const void Send(std::string data) override
+	const void Send(const std::string& data) override
 	{
 		OutputDebugStringA(data.c_str());
 	}
diff --git a/L2BotDll/Transports/NamedPipeTransport.h b/L2BotDll/Transports/NamedPipeTransport.h
index 3f25985..f079eb3 100644
--- a/L2BotDll/Transports/NamedPipeTransport.h
+++ b/L2BotDll/Transports/NamedPipeTransport.h
@@ -37,7 +37,7 @@ public:
 		return true;
 	}
 
-	const void Send(std::string data) override
+	const void Send(const std::string& data) override
 	{
 		if (!m_Pipe.IsConnected())
 		{