Index: ps/trunk/binaries/data/mods/public/gui/lobby/lobby.js
===================================================================
--- ps/trunk/binaries/data/mods/public/gui/lobby/lobby.js
+++ ps/trunk/binaries/data/mods/public/gui/lobby/lobby.js
@@ -111,20 +111,19 @@
 var g_Kicked = false;
 
 /**
- * Notifications sent by XmppClient.cpp
+ * Processing of notifications sent by XmppClient.cpp.
+ *
+ * @returns true if the playerlist GUI must be updated.
  */
 var g_NetMessageTypes = {
 	"system": {
 		// Three cases are handled in prelobby.js
-		"registered": msg => {
-		},
-		"connected": msg => {
-		},
+		"registered": msg => false,
+		"connected": msg => false,
 		"disconnected": msg => {
 
 			updateGameList();
 			updateLeaderboard();
-			updatePlayerList();
 
 			Engine.GetGUIObjectByName("chatInput").hidden = true;
 
@@ -138,6 +137,7 @@
 					"time": msg.time,
 					"text": translate("Disconnected.") + " " + msg.text
 				});
+			return true;
 		},
 		"error": msg => {
 			addChatMessage({
@@ -145,11 +145,13 @@
 				"time": msg.time,
 				"text": msg.text
 			});
+			return false;
 		}
 	},
 	"chat": {
 		"subject": msg => {
 			updateSubject(msg.text);
+			return false;
 		},
 		"join": msg => {
 			addChatMessage({
@@ -159,6 +161,7 @@
 				"time": msg.time,
 				"isSpecial": true
 			});
+			return true;
 		},
 		"leave": msg => {
 			addChatMessage({
@@ -171,9 +174,10 @@
 
 			if (msg.text == g_Username)
 				Engine.DisconnectXmppClient();
+
+			return true;
 		},
-		"presence": msg => {
-		},
+		"presence": msg => true,
 		"role": msg => {
 			Engine.GetGUIObjectByName("chatInput").hidden = Engine.LobbyGetPlayerRole(g_Username) == "visitor";
 
@@ -204,6 +208,8 @@
 
 			if (g_SelectedPlayer == msg.text)
 				updateUserRoleText(g_SelectedPlayer);
+
+			return false;
 		},
 		"nick": msg => {
 			addChatMessage({
@@ -214,12 +220,15 @@
 				"time": msg.time,
 				"isSpecial": true
 			});
+			return true;
 		},
 		"kicked": msg => {
 			handleKick(false, msg.text, msg.data || "", msg.time);
+			return true;
 		},
 		"banned": msg => {
 			handleKick(true, msg.text, msg.data || "", msg.time);
+			return true;
 		},
 		"room-message": msg => {
 			addChatMessage({
@@ -227,6 +236,7 @@
 				"text": escapeText(msg.text),
 				"time": msg.time
 			});
+			return false;
 		},
 		"private-message": msg => {
 			// Announcements and the Message of the Day are sent by the server directly
@@ -246,13 +256,25 @@
 					"time": msg.time,
 					"private" : true
 				});
+			return false;
 		}
 	},
 	"game": {
-		"gamelist": msg => updateGameList(),
-		"profile": msg => updateProfile(),
-		"leaderboard": msg => updateLeaderboard(),
-		"ratinglist": msg => updatePlayerList()
+		"gamelist": msg => {
+			updateGameList();
+			return false;
+		},
+		"profile": msg => {
+			updateProfile();
+			return false;
+		},
+		"leaderboard": msg => {
+			updateLeaderboard();
+			return false;
+		},
+		"ratinglist": msg => {
+			return true;
+		}
 	}
 };
 
@@ -1137,6 +1159,8 @@
 {
 	updateTimers();
 
+	let updateList = false;
+
 	while (true)
 	{
 		let msg = Engine.LobbyGuiPollMessage();
@@ -1153,13 +1177,15 @@
 			warn("Unrecognised message level: " + msg.level);
 			continue;
 		}
-		g_NetMessageTypes[msg.type][msg.level](msg);
 
-		// To improve performance, only update the playerlist GUI when
-		// the last update in the current stack is processed
-		if (msg.type == "chat" && Engine.LobbyGetMucMessageCount() == 0)
-			updatePlayerList();
+		if (g_NetMessageTypes[msg.type][msg.level](msg))
+			updateList = true;
 	}
+
+	// To improve performance, only update the playerlist GUI when
+	// the last update in the current stack is processed
+	if (updateList)
+		updatePlayerList();
 }
 
 /**
Index: ps/trunk/source/lobby/IXmppClient.h
===================================================================
--- ps/trunk/source/lobby/IXmppClient.h
+++ ps/trunk/source/lobby/IXmppClient.h
@@ -50,7 +50,6 @@
 	virtual void GetSubject(std::string& subject) = 0;
 	virtual void GUIGetPlayerList(const ScriptInterface& scriptInterface, JS::MutableHandleValue ret) = 0;
 	virtual void ClearPresenceUpdates() = 0;
-	virtual int GetMucMessageCount() = 0;
 	virtual void GUIGetGameList(const ScriptInterface& scriptInterface, JS::MutableHandleValue ret) = 0;
 	virtual void GUIGetBoardList(const ScriptInterface& scriptInterface, JS::MutableHandleValue ret) = 0;
 	virtual void GUIGetProfile(const ScriptInterface& scriptInterface, JS::MutableHandleValue ret) = 0;
Index: ps/trunk/source/lobby/XmppClient.h
===================================================================
--- ps/trunk/source/lobby/XmppClient.h
+++ ps/trunk/source/lobby/XmppClient.h
@@ -146,7 +146,6 @@
 	void GuiPollMessage(const ScriptInterface& scriptInterface, JS::MutableHandleValue ret);
 	void SendMUCMessage(const std::string& message);
 	void ClearPresenceUpdates();
-	int GetMucMessageCount();
 protected:
 	void PushGuiMessage(XmppClient::GUIMessage message);
 	void CreateGUIMessage(const std::string& type, const std::string& level, const std::string& text = "", const std::string& data = "");
Index: ps/trunk/source/lobby/XmppClient.cpp
===================================================================
--- ps/trunk/source/lobby/XmppClient.cpp
+++ ps/trunk/source/lobby/XmppClient.cpp
@@ -614,18 +614,6 @@
 }
 
 /**
- * Used in order to update the GUI only once when multiple updates are queued.
- */
-int XmppClient::GetMucMessageCount()
-{
-	return std::count_if(m_GuiMessageQueue.begin(), m_GuiMessageQueue.end(),
-		[](XmppClient::GUIMessage& message)
-		{
-			return message.type == L"chat";
-		});
-}
-
-/**
  * Handle a room message.
  */
 void XmppClient::handleMUCMessage(glooxwrapper::MUCRoom*, const glooxwrapper::Message& msg, bool priv)
Index: ps/trunk/source/lobby/scripting/JSInterface_Lobby.h
===================================================================
--- ps/trunk/source/lobby/scripting/JSInterface_Lobby.h
+++ ps/trunk/source/lobby/scripting/JSInterface_Lobby.h
@@ -44,7 +44,6 @@
 	void SendChangeStateGame(ScriptInterface::CxPrivate* pCxPrivate, const std::wstring& nbp, const std::wstring& players);
 	JS::Value GetPlayerList(ScriptInterface::CxPrivate* pCxPrivate);
 	void LobbyClearPresenceUpdates(ScriptInterface::CxPrivate* pCxPrivate);
-	int LobbyGetMucMessageCount(ScriptInterface::CxPrivate* pCxPrivate);
 	JS::Value GetGameList(ScriptInterface::CxPrivate* pCxPrivate);
 	JS::Value GetBoardList(ScriptInterface::CxPrivate* pCxPrivate);
 	JS::Value GetProfile(ScriptInterface::CxPrivate* pCxPrivate);
Index: ps/trunk/source/lobby/scripting/JSInterface_Lobby.cpp
===================================================================
--- ps/trunk/source/lobby/scripting/JSInterface_Lobby.cpp
+++ ps/trunk/source/lobby/scripting/JSInterface_Lobby.cpp
@@ -47,7 +47,6 @@
 	scriptInterface.RegisterFunction<void, std::wstring, std::wstring, &JSI_Lobby::SendChangeStateGame>("SendChangeStateGame");
 	scriptInterface.RegisterFunction<JS::Value, &JSI_Lobby::GetPlayerList>("GetPlayerList");
 	scriptInterface.RegisterFunction<void, &JSI_Lobby::LobbyClearPresenceUpdates>("LobbyClearPresenceUpdates");
-	scriptInterface.RegisterFunction<int, &JSI_Lobby::LobbyGetMucMessageCount>("LobbyGetMucMessageCount");
 	scriptInterface.RegisterFunction<JS::Value, &JSI_Lobby::GetGameList>("GetGameList");
 	scriptInterface.RegisterFunction<JS::Value, &JSI_Lobby::GetBoardList>("GetBoardList");
 	scriptInterface.RegisterFunction<JS::Value, &JSI_Lobby::GetProfile>("GetProfile");
@@ -184,11 +183,6 @@
 	g_XmppClient->ClearPresenceUpdates();
 }
 
-int JSI_Lobby::LobbyGetMucMessageCount(ScriptInterface::CxPrivate* UNUSED(pCxPrivate))
-{
-	return g_XmppClient ? g_XmppClient->GetMucMessageCount() : 0;
-}
-
 JS::Value JSI_Lobby::GetGameList(ScriptInterface::CxPrivate* pCxPrivate)
 {
 	if (!g_XmppClient)