diff --git a/binaries/data/mods/public/gui/session/Menu.js b/binaries/data/mods/public/gui/session/Menu.js
index 628fcc6a60..47c58d4fe4 100644
--- a/binaries/data/mods/public/gui/session/Menu.js
+++ b/binaries/data/mods/public/gui/session/Menu.js
@@ -3,7 +3,7 @@
  */
 class Menu
 {
-	constructor(pauseControl, playerViewControl, chat)
+	constructor(pauseControl, playerViewControl, chat, closePageCallback)
 	{
 		this.menuButton = Engine.GetGUIObjectByName("menuButton");
 		this.menuButton.onPress = this.toggle.bind(this);
@@ -26,7 +26,7 @@ class Menu
 		this.buttons = handlerNames.map((handlerName, i) =>
 		{
 			const handler = new MenuButtons.prototype[handlerName](menuButtons[i], pauseControl, playerViewControl, chat);
-			this.initButton(handler, menuButtons[i], i);
+			this.initButton(handler, menuButtons[i], i, closePageCallback);
 			return handler;
 		});
 
@@ -62,12 +62,12 @@ class Menu
 		this.startAnimation();
 	}
 
-	initButton(handler, button, i)
+	initButton(handler, button, i, closePageCallback)
 	{
 		button.onPress = () =>
 		{
 			this.close();
-			handler.onPress();
+			handler.onPress(closePageCallback);
 		};
 		button.size.top = this.buttonHeight * (i + 1) + this.margin;
 		button.size.bottom = this.buttonHeight * (i + 2);
diff --git a/binaries/data/mods/public/gui/session/MenuButtons.js b/binaries/data/mods/public/gui/session/MenuButtons.js
index 731ac8aff2..c792a405c3 100644
--- a/binaries/data/mods/public/gui/session/MenuButtons.js
+++ b/binaries/data/mods/public/gui/session/MenuButtons.js
@@ -256,13 +256,13 @@ MenuButtons.prototype.Exit = class
 		this.pauseControl = pauseControl;
 	}
 
-	onPress()
+	onPress(closePageCallback)
 	{
 		for (const name in QuitConfirmationMenu.prototype)
 		{
 			const quitConfirmation = new QuitConfirmationMenu.prototype[name]();
 			if (quitConfirmation.enabled())
-				quitConfirmation.display();
+				quitConfirmation.display(closePageCallback);
 		}
 	}
 };
diff --git a/binaries/data/mods/public/gui/session/NetworkStatusOverlay.js b/binaries/data/mods/public/gui/session/NetworkStatusOverlay.js
index c0c930d7f3..223d0660e7 100644
--- a/binaries/data/mods/public/gui/session/NetworkStatusOverlay.js
+++ b/binaries/data/mods/public/gui/session/NetworkStatusOverlay.js
@@ -4,12 +4,15 @@
  */
 class NetworkStatusOverlay
 {
-	constructor()
+	constructor(closePageCallback)
 	{
 		this.netStatus = Engine.GetGUIObjectByName("netStatus");
 		this.loadingClientsText = Engine.GetGUIObjectByName("loadingClientsText");
 
-		Engine.GetGUIObjectByName("disconnectedExitButton").onPress = () => { endGame(true); };
+		Engine.GetGUIObjectByName("disconnectedExitButton").onPress = () =>
+		{
+			closePageCallback({ [Engine.openRequest]: endGame(true) });
+		};
 
 		registerNetworkStatusChangeHandler(this.onNetStatusMessage.bind(this));
 		registerClientsLoadingHandler(this.onClientsLoadingMessage.bind(this));
diff --git a/binaries/data/mods/public/gui/session/SessionMessageBox.js b/binaries/data/mods/public/gui/session/SessionMessageBox.js
index 9d17a80632..c39689868e 100644
--- a/binaries/data/mods/public/gui/session/SessionMessageBox.js
+++ b/binaries/data/mods/public/gui/session/SessionMessageBox.js
@@ -4,7 +4,7 @@
  */
 class SessionMessageBox
 {
-	async display()
+	async display(closePageCallback)
 	{
 		closeOpenDialogs();
 		g_PauseControl.implicitPause();
@@ -20,7 +20,11 @@ class SessionMessageBox
 			});
 
 		if (this.Buttons && this.Buttons[buttonId].onPress)
-			this.Buttons[buttonId].onPress.call(this);
+		{
+			const ret = this.Buttons[buttonId].onPress.call(this);
+			if (ret !== undefined)
+				closePageCallback({ [Engine.openRequest]: ret });
+		}
 
 		if (this.ResumeOnClose)
 			resumeGame();
diff --git a/binaries/data/mods/public/gui/session/message_box/QuitConfirmation.js b/binaries/data/mods/public/gui/session/message_box/QuitConfirmation.js
index 0879b175f5..9b0e60acc0 100644
--- a/binaries/data/mods/public/gui/session/message_box/QuitConfirmation.js
+++ b/binaries/data/mods/public/gui/session/message_box/QuitConfirmation.js
@@ -18,12 +18,12 @@ QuitConfirmation.prototype.Buttons =
 		{
 		// Translation: Shown in the Dialog that shows up when the game finishes
 			"caption": translate("Quit and View Summary"),
-			"onPress": () => { endGame(true); }
+			"onPress": () => endGame(true)
 		},
 		{
 		// Translation: Shown in the Dialog that shows up when the game finishes
 			"caption": translate("Quit"),
-			"onPress": () => { endGame(false); }
+			"onPress": () => endGame(false)
 		}
 	];
 
@@ -31,3 +31,4 @@ QuitConfirmation.prototype.Width = 600;
 QuitConfirmation.prototype.Height = 200;
 
 QuitConfirmation.prototype.ResumeOnClose = false;
+
diff --git a/binaries/data/mods/public/gui/session/message_box/QuitConfirmationDefeat.js b/binaries/data/mods/public/gui/session/message_box/QuitConfirmationDefeat.js
index 40713a9614..afb9ed9145 100644
--- a/binaries/data/mods/public/gui/session/message_box/QuitConfirmationDefeat.js
+++ b/binaries/data/mods/public/gui/session/message_box/QuitConfirmationDefeat.js
@@ -3,7 +3,7 @@
  */
 class QuitConfirmationDefeat extends QuitConfirmation
 {
-	constructor()
+	constructor(closePageCallback)
 	{
 		super();
 
@@ -11,10 +11,10 @@ class QuitConfirmationDefeat extends QuitConfirmation
 			return;
 
 		this.confirmHandler = undefined;
-		registerPlayersFinishedHandler(this.onPlayersFinished.bind(this));
+		registerPlayersFinishedHandler(this.onPlayersFinished.bind(this, closePageCallback));
 	}
 
-	onPlayersFinished(players, won)
+	onPlayersFinished(closePageCallback, players, won)
 	{
 		if (players.indexOf(Engine.GetPlayerID()) == -1)
 			return;
@@ -22,11 +22,11 @@ class QuitConfirmationDefeat extends QuitConfirmation
 		// Defer simulation result until
 		// 1. the loading screen finished for all networked clients (g_IsNetworkedActive)
 		// 2. all messages modifying g_Players victory state were processed (next turn)
-		this.confirmHandler = this.confirmExit.bind(this, won);
+		this.confirmHandler = this.confirmExit.bind(this, won, closePageCallback);
 		registerSimulationUpdateHandler(this.confirmHandler);
 	}
 
-	confirmExit(won)
+	confirmExit(won, closePageCallback)
 	{
 		if (g_IsNetworked && !g_IsNetworkedActive)
 			return;
@@ -47,7 +47,7 @@ class QuitConfirmationDefeat extends QuitConfirmation
 
 		this.Buttons = askExit ? super.Buttons : undefined;
 
-		this.display();
+		this.display(closePageCallback);
 	}
 }
 
diff --git a/binaries/data/mods/public/gui/session/message_box/QuitConfirmationMenu.js b/binaries/data/mods/public/gui/session/message_box/QuitConfirmationMenu.js
index 9be8307cc1..92efb80c44 100644
--- a/binaries/data/mods/public/gui/session/message_box/QuitConfirmationMenu.js
+++ b/binaries/data/mods/public/gui/session/message_box/QuitConfirmationMenu.js
@@ -6,7 +6,7 @@ ReturnQuestion.prototype.Caption = translate("Do you want to resign or will you
 ReturnQuestion.prototype.Buttons = [
 	{
 		"caption": translate("I will return"),
-		"onPress": () => { endGame(false); }
+		"onPress": () => endGame(false)
 	},
 	{
 		"caption": translate("I resign"),
@@ -74,9 +74,9 @@ QuitConfirmationMenu.prototype.MultiplayerClient.prototype.Buttons =
 		},
 		{
 			"caption": translate("Yes"),
-			"onPress": () =>
+			"onPress": closePageCallback =>
 			{
-				(new ReturnQuestion()).display();
+				(new ReturnQuestion()).display(closePageCallback);
 			}
 		}
 	];
diff --git a/binaries/data/mods/public/gui/session/message_box/QuitConfirmationReplay.js b/binaries/data/mods/public/gui/session/message_box/QuitConfirmationReplay.js
index 189555539d..b629a8857b 100644
--- a/binaries/data/mods/public/gui/session/message_box/QuitConfirmationReplay.js
+++ b/binaries/data/mods/public/gui/session/message_box/QuitConfirmationReplay.js
@@ -3,10 +3,10 @@
  */
 class QuitConfirmationReplay extends QuitConfirmation
 {
-	constructor()
+	constructor(closePageCallback)
 	{
 		super();
-		Engine.GetGUIObjectByName("session").onReplayFinished = this.display.bind(this);
+		Engine.GetGUIObjectByName("session").onReplayFinished = this.display.bind(this, closePageCallback);
 	}
 }
 
@@ -26,11 +26,11 @@ QuitConfirmationReplay.prototype.Buttons =
 		{
 		// Translation: Shown in the Dialog that shows up when a replay finishes
 			"caption": translate("Quit and View Summary"),
-			"onPress": () => { endGame(true); }
+			"onPress": () => endGame(true)
 		},
 		{
 		// Translation: Shown in the Dialog that shows up when a replay finishes
 			"caption": translate("Quit"),
-			"onPress": () => { endGame(false); }
+			"onPress": () => endGame(false)
 		}
 	];
diff --git a/binaries/data/mods/public/gui/session/messages.js b/binaries/data/mods/public/gui/session/messages.js
index 6c1a3bffb3..7e23066702 100644
--- a/binaries/data/mods/public/gui/session/messages.js
+++ b/binaries/data/mods/public/gui/session/messages.js
@@ -335,7 +335,7 @@ function findGuidForPlayerID(playerID)
 /**
  * Processes all pending notifications sent from the GUIInterface simulation component.
  */
-function handleNotifications()
+function handleNotifications(closePageCallback)
 {
 	for (const notification of Engine.GuiInterfaceCall("GetNotifications"))
 	{
@@ -346,7 +346,7 @@ function handleNotifications()
 		}
 
 		for (const player of notification.players)
-			g_NotificationsTypes[notification.type](notification, player);
+			g_NotificationsTypes[notification.type](notification, player, closePageCallback);
 	}
 }
 
@@ -374,7 +374,7 @@ function toggleTutorial()
 /**
  * Updates the tutorial panel when a new goal.
  */
-function updateTutorial(notification)
+function updateTutorial(notification, closePageCallback)
 {
 	// Show the tutorial panel if not yet done
 	Engine.GetGUIObjectByName("tutorialPanel").hidden = false;
@@ -400,7 +400,11 @@ function updateTutorial(notification)
 		{
 			Engine.GetGUIObjectByName("tutorialWarning").caption = translate("Click to quit this tutorial.");
 			Engine.GetGUIObjectByName("tutorialReady").caption = translate("Quit");
-			Engine.GetGUIObjectByName("tutorialReady").onPress = () => { endGame(true); };
+
+			Engine.GetGUIObjectByName("tutorialReady").onPress = () =>
+			{
+				closePageCallback({ [Engine.openRequest]: endGame(true) });
+			};
 		}
 		else
 			Engine.GetGUIObjectByName("tutorialWarning").caption = translate("Click when ready.");
diff --git a/binaries/data/mods/public/gui/session/session.js b/binaries/data/mods/public/gui/session/session.js
index afb7491080..bb55f305f7 100644
--- a/binaries/data/mods/public/gui/session/session.js
+++ b/binaries/data/mods/public/gui/session/session.js
@@ -252,13 +252,12 @@ function GetTechnologyData(technologyName, civ)
 	return g_TechnologyData[civ][technologyName];
 }
 
-function init(initData, hotloadData)
+async function init(initData, hotloadData)
 {
 	if (!g_Settings)
 	{
 		Engine.EndGame();
-		Engine.SwitchGuiPage("page_pregame.xml");
-		return undefined;
+		return { [Engine.openRequest]: { "page": "page_pregame.xml" } };
 	}
 
 	// Fallback used by atlas
@@ -289,8 +288,6 @@ function init(initData, hotloadData)
 	g_DiplomacyColors.registerDiplomacyColorsChangeHandler(updateGUIObjects);
 	g_PauseControl = new PauseControl();
 	g_PlayerViewControl.registerPreViewedPlayerChangeHandler(removeStatusBarDisplay);
-	g_PlayerViewControl.registerViewedPlayerChangeHandler(resetTemplates);
-
 	g_Ambient = new Ambient();
 	g_AutoFormation = new AutoFormation();
 	g_Chat = new Chat(g_PlayerViewControl, g_Cheats);
@@ -299,16 +296,12 @@ function init(initData, hotloadData)
 	g_DiplomacyDialog = new DiplomacyDialog(g_PlayerViewControl, g_DiplomacyColors);
 	g_GameSpeedControl = new GameSpeedControl(g_PlayerViewControl);
 	g_MatchSettingsDialog = new MatchSettingsDialog(g_PlayerViewControl, mapCache);
-	g_Menu = new Menu(g_PauseControl, g_PlayerViewControl, g_Chat);
 	g_MiniMapPanel = new MiniMapPanel(g_PlayerViewControl, g_DiplomacyColors, g_WorkerTypes);
-	g_NetworkStatusOverlay = new NetworkStatusOverlay();
 	g_NetworkDelayOverlay = new NetworkDelayOverlay();
 	g_OutOfSyncNetwork = new OutOfSyncNetwork();
 	g_OutOfSyncReplay = new OutOfSyncReplay();
 	g_PanelEntityManager = new PanelEntityManager(g_PlayerViewControl, g_Selection, g_PanelEntityOrder);
 	g_PauseOverlay = new PauseOverlay(g_PauseControl);
-	g_QuitConfirmationDefeat = new QuitConfirmationDefeat();
-	g_QuitConfirmationReplay = new QuitConfirmationReplay();
 	g_RangeOverlayManager = new RangeOverlayManager(g_Selection);
 	g_ResearchProgress = new ResearchProgress(g_PlayerViewControl, g_Selection);
 	g_TradeDialog = new TradeDialog(g_PlayerViewControl);
@@ -324,6 +317,21 @@ function init(initData, hotloadData)
 	initializeMusic(); // before changing the perspective
 	Engine.SetBoundingBoxDebugOverlay(false);
 
+	const promise = Promise.race([g_IsNetworked ? handleNetMessages() : new Promise(() => {}),
+		new Promise(closePageCallback =>
+		{
+			g_PlayerViewControl.registerViewedPlayerChangeHandler(resetTemplates.bind(undefined,
+				closePageCallback));
+			g_Menu = new Menu(g_PauseControl, g_PlayerViewControl, g_Chat, closePageCallback);
+			g_NetworkStatusOverlay = new NetworkStatusOverlay(closePageCallback);
+			g_QuitConfirmationDefeat = new QuitConfirmationDefeat(closePageCallback);
+			g_QuitConfirmationReplay = new QuitConfirmationReplay(closePageCallback);
+			// TODO: use event instead
+			onSimulationUpdate(closePageCallback);
+			Engine.GetGUIObjectByName("session").onSimulationUpdate =
+				onSimulationUpdate.bind(undefined, closePageCallback);
+		})]);
+
 	for (const handler of g_PlayersInitHandlers)
 		handler();
 
@@ -337,12 +345,9 @@ function init(initData, hotloadData)
 		g_Players = hotloadData.player;
 	}
 
-	// TODO: use event instead
-	onSimulationUpdate();
-
 	setTimeout(displayGamestateNotifications, 1000);
 
-	return g_IsNetworked ? handleNetMessages() : new Promise(() => {});
+	return promise;
 }
 
 function registerPlayersInitHandler(handler)
@@ -448,14 +453,14 @@ function initializeMusic()
 	global.music.setState(global.music.states.PEACE);
 }
 
-function resetTemplates()
+function resetTemplates(closePageCallback)
 {
 	// Update GUI and clear player-dependent cache
 	g_TemplateData = {};
 	Engine.GuiInterfaceCall("ResetTemplateModified");
 
 	// TODO: do this more selectively
-	onSimulationUpdate();
+	onSimulationUpdate(closePageCallback);
 }
 
 /**
@@ -560,23 +565,22 @@ function endGame(showSummary)
 		const menu = g_CampaignSession.getMenu();
 		if (g_InitAttributes.campaignData.skipSummary)
 		{
-			Engine.SwitchGuiPage(menu);
-			return;
+			return { "page": menu };
 		}
 		summaryData.campaignData = { "filename": g_InitAttributes.campaignData.run };
 		summaryData.nextPage = menu;
 	}
 
 	if (showSummary)
-		Engine.SwitchGuiPage("page_summary.xml", summaryData);
-	else if (g_InitAttributes.campaignData)
-		Engine.SwitchGuiPage(summaryData.nextPage, summaryData.campaignData);
-	else if (Engine.HasXmppClient())
-		Engine.SwitchGuiPage("page_lobby.xml", { "dialog": false });
-	else if (g_IsReplay)
-		Engine.SwitchGuiPage("page_replaymenu.xml");
-	else
-		Engine.SwitchGuiPage("page_pregame.xml");
+		return { "page": "page_summary.xml", "argument": summaryData };
+	if (g_InitAttributes.campaignData)
+		return { "page": summaryData.nextPage, "argument": summaryData.campaignData };
+	if (Engine.HasXmppClient())
+		return { "page": "page_lobby.xml", "argument": { "dialog": false } };
+	if (g_IsReplay)
+		return { "page": "page_replaymenu.xml" };
+
+	return { "page": "page_pregame.xml" };
 }
 
 // Return some data that we'll use when hotloading this file after changes
@@ -654,7 +658,7 @@ function onTick()
 	Engine.GuiInterfaceCall("ClearRenamedEntities");
 }
 
-function onSimulationUpdate()
+function onSimulationUpdate(closePageCallback)
 {
 	// Templates change depending on technologies and auras, so they have to be reloaded after such a change.
 	// g_TechnologyData data never changes, so it shouldn't be deleted.
@@ -682,7 +686,7 @@ function onSimulationUpdate()
 		handler();
 
 	// TODO: Move to handlers
-	handleNotifications();
+	handleNotifications(closePageCallback);
 	updateGUIObjects();
 }
 
diff --git a/binaries/data/mods/public/gui/session/session.xml b/binaries/data/mods/public/gui/session/session.xml
index 14c829fdfb..9187560b50 100644
--- a/binaries/data/mods/public/gui/session/session.xml
+++ b/binaries/data/mods/public/gui/session/session.xml
@@ -31,10 +31,6 @@
 		restoreSavedGameData(arguments[0]);
 	</action>
 
-	<action on="SimulationUpdate">
-		onSimulationUpdate();
-	</action>
-
 	<object name="primaryOverlays">
 		<!-- Chat messages -->
 		<object name="chatPanel" size="3 131 100% 100%-240" z="0" absolute="true">