diff --git a/Gems/Atom/Bootstrap/Code/Source/BootstrapSystemComponent.cpp b/Gems/Atom/Bootstrap/Code/Source/BootstrapSystemComponent.cpp
index e3749175bc..8a6b7db1ca 100644
--- a/Gems/Atom/Bootstrap/Code/Source/BootstrapSystemComponent.cpp
+++ b/Gems/Atom/Bootstrap/Code/Source/BootstrapSystemComponent.cpp
@@ -176,7 +176,10 @@ namespace AZ
 
                 m_isAssetCatalogLoaded = true;
 
-                RPI::RPISystemInterface::Get()->InitializeSystemAssets();
+                if (!RPI::RPISystemInterface::Get()->IsInitialized())
+                {
+                    RPI::RPISystemInterface::Get()->InitializeSystemAssets();
+                }
 
                 if (!RPI::RPISystemInterface::Get()->IsInitialized())
                 {
diff --git a/Gems/Atom/Tools/AtomToolsFramework/Code/Include/AtomToolsFramework/Application/AtomToolsApplication.h b/Gems/Atom/Tools/AtomToolsFramework/Code/Include/AtomToolsFramework/Application/AtomToolsApplication.h
index f87aca641d..d55755a242 100644
--- a/Gems/Atom/Tools/AtomToolsFramework/Code/Include/AtomToolsFramework/Application/AtomToolsApplication.h
+++ b/Gems/Atom/Tools/AtomToolsFramework/Code/Include/AtomToolsFramework/Application/AtomToolsApplication.h
@@ -16,7 +16,6 @@
 #include <AzCore/UserSettings/UserSettingsProvider.h>
 
 #include <AzFramework/Application/Application.h>
-#include <AzFramework/Asset/AssetCatalogBus.h>
 #include <AzFramework/Asset/AssetSystemBus.h>
 
 #include <AzQtComponents/Application/AzQtApplication.h>
@@ -36,7 +35,6 @@ namespace AtomToolsFramework
         , public AzQtComponents::AzQtApplication
         , protected AzToolsFramework::AssetDatabase::AssetDatabaseRequestsBus::Handler
         , protected AzFramework::AssetSystemStatusBus::Handler
-        , protected AzFramework::AssetCatalogEventBus::Handler
         , protected AzToolsFramework::EditorPythonConsoleNotificationBus::Handler
         , protected AZ::UserSettingsOwnerRequestBus::Handler
         , protected AtomToolsMainWindowNotificationBus::Handler
@@ -69,11 +67,6 @@ namespace AtomToolsFramework
         void OnMainWindowClosing() override;
         //////////////////////////////////////////////////////////////////////////
 
-        //////////////////////////////////////////////////////////////////////////
-        // AzFramework::AssetCatalogEventBus::Handler overrides ...
-        void OnCatalogLoaded(const char* catalogFile) override;
-        //////////////////////////////////////////////////////////////////////////
-
         //////////////////////////////////////////////////////////////////////////
         // AssetDatabaseRequestsBus::Handler overrides...
         bool GetAssetDatabaseLocation(AZStd::string& result) override;
diff --git a/Gems/Atom/Tools/AtomToolsFramework/Code/Source/Application/AtomToolsApplication.cpp b/Gems/Atom/Tools/AtomToolsFramework/Code/Source/Application/AtomToolsApplication.cpp
index 5751271312..a949852b5e 100644
--- a/Gems/Atom/Tools/AtomToolsFramework/Code/Source/Application/AtomToolsApplication.cpp
+++ b/Gems/Atom/Tools/AtomToolsFramework/Code/Source/Application/AtomToolsApplication.cpp
@@ -92,7 +92,6 @@ namespace AtomToolsFramework
         AtomToolsMainWindowNotificationBus::Handler::BusDisconnect();
         AzToolsFramework::AssetDatabase::AssetDatabaseRequestsBus::Handler::BusDisconnect();
         AzToolsFramework::EditorPythonConsoleNotificationBus::Handler::BusDisconnect();
-        AzFramework::AssetCatalogEventBus::Handler::BusDisconnect();
     }
 
     void AtomToolsApplication::CreateReflectionManager()
@@ -175,11 +174,18 @@ namespace AtomToolsFramework
         AzToolsFramework::AssetBrowser::AssetDatabaseLocationNotificationBus::Broadcast(
             &AzToolsFramework::AssetBrowser::AssetDatabaseLocationNotifications::OnDatabaseInitialized);
 
-        AzFramework::AssetCatalogEventBus::Handler::BusConnect();
         AZ::Data::AssetCatalogRequestBus::Broadcast(&AZ::Data::AssetCatalogRequestBus::Events::LoadCatalog, "@assets@/assetcatalog.xml");
 
+        if (!AZ::RPI::RPISystemInterface::Get()->IsInitialized())
+        {
+            AZ::RPI::RPISystemInterface::Get()->InitializeSystemAssets();
+        }
+
         LoadSettings();
 
+        AtomToolsMainWindowFactoryRequestBus::Broadcast(&AtomToolsMainWindowFactoryRequestBus::Handler::CreateMainWindow);
+        AtomToolsMainWindowNotificationBus::Handler::BusConnect();
+
         auto editorPythonEventsInterface = AZ::Interface<AzToolsFramework::EditorPythonEventsInterface>::Get();
         if (editorPythonEventsInterface)
         {
@@ -189,6 +195,9 @@ namespace AtomToolsFramework
             editorPythonEventsInterface->StartPython();
         }
 
+        QTimer::singleShot(0, this, [this]() {
+            ProcessCommandLine(m_commandLine);
+        });
         m_timer.start();
     }
 
@@ -197,26 +206,12 @@ namespace AtomToolsFramework
         ExitMainLoop();
     }
 
-    void AtomToolsApplication::OnCatalogLoaded(const char* catalogFile)
-    {
-        AZ_UNUSED(catalogFile);
-
-        // Delay execution of commands and scripts post initialization
-        AZ::TickBus::QueueFunction([this]() {
-            AtomToolsMainWindowFactoryRequestBus::Broadcast(&AtomToolsMainWindowFactoryRequestBus::Handler::CreateMainWindow);
-            AtomToolsMainWindowNotificationBus::Handler::BusConnect();
-            ProcessCommandLine(m_commandLine);
-        });
-        AzFramework::AssetCatalogEventBus::Handler::BusDisconnect();
-    }
-
     void AtomToolsApplication::Destroy()
     {
         // before modules are unloaded, destroy UI to free up any assets it cached
         AtomToolsMainWindowFactoryRequestBus::Broadcast(&AtomToolsMainWindowFactoryRequestBus::Handler::DestroyMainWindow);
         m_styleManager.reset();
 
-        AzFramework::AssetCatalogEventBus::Handler::BusDisconnect();
         AzToolsFramework::EditorPythonConsoleNotificationBus::Handler::BusDisconnect();
         AzToolsFramework::AssetDatabase::AssetDatabaseRequestsBus::Handler::BusDisconnect();
         AtomToolsMainWindowNotificationBus::Handler::BusDisconnect();