CEF performance improvements

Client/cefweb/CWebApp.cpp

@@ -57,8 +57,7 @@ namespace
         // Prevent Chromium from dropping privileges; required for elevated launches (see chromium/3960)
         commandLine->AppendSwitch("do-not-de-elevate");
 
-        // Must apply essential CEF switches regardless of WebCore availability
-        commandLine->AppendSwitch("disable-gpu-compositing");
+        // Enable external begin frame scheduling for MTA-controlled rendering
         commandLine->AppendSwitch("enable-begin-frame-scheduling");
         // Explicitly block account sign-in to avoid crashes when Google API keys are registered on the system
         commandLine->AppendSwitchWithValue("allow-browser-signin", "false");
@@ -71,6 +70,7 @@ namespace
         }
 
         bool disableGpu = false;
+        bool enableVideoAccel = true;
         if (g_pCore && IsReadablePointer(g_pCore, sizeof(void*)))
         {
             auto* cvars = g_pCore->GetCVars();
@@ -79,6 +79,8 @@ namespace
                 bool gpuEnabled = true;
                 cvars->Get("browser_enable_gpu", gpuEnabled);
                 disableGpu = !gpuEnabled;
+
+                cvars->Get("browser_enable_video_acceleration", enableVideoAccel);
             }
         }
 
@@ -92,19 +94,31 @@ namespace
             else
             {
                 // In Wine, we generally want to try GPU (DXVK handles it well)
-                // But disable-gpu-compositing is already set above which is key
                 // If user hasn't explicitly disabled GPU in cvars, let it run
             }
         }
 
         if (disableGpu)
+        {
             commandLine->AppendSwitch("disable-gpu");
+            // Also disable GPU compositing when GPU is disabled
+            commandLine->AppendSwitch("disable-gpu-compositing");
+        }
+
+        // Hardware video decoding - enable when GPU is enabled and video acceleration is requested
+        if (!disableGpu && enableVideoAccel)
+        {
+            commandLine->AppendSwitch("enable-accelerated-video-decode");
+        }
     }
 }  // namespace
 
 [[nodiscard]] CefRefPtr<CefResourceHandler> CWebApp::HandleError(const SString& strError, unsigned int uiError)
 {
-    auto stream = CefStreamReader::CreateForData((void*)strError.c_str(), strError.length());
+    auto stream = CefStreamReader::CreateForData(
+        (void*)strError.c_str(),
+        strError.length()
+    );
     if (!stream)
         return nullptr;
     return CefRefPtr<CefResourceHandler>(new CefStreamResourceHandler(uiError, strError, "text/plain", CefResponse::HeaderMap(), stream));

Client/cefweb/CWebCore.cpp

@@ -440,7 +440,20 @@ void CWebCore::DoEventQueuePulse()
         event.callback();
     }
 
-    // Invoke paint method if necessary on the main thread
+    // Request new frames from CEF using external begin frame scheduling
+    // This synchronizes CEF rendering with MTA's render loop, eliminating
+    // the previous 250ms blocking wait in OnPaint
+    for (auto& view : m_WebViews)
+    {
+        if (view->IsBeingDestroyed() || view->GetRenderingPaused())
+            continue;
+
+        auto browser = view->GetCefBrowser();
+        if (browser)
+            browser->GetHost()->SendExternalBeginFrame();
+    }
+
+    // Copy rendered data to D3D textures on the main thread
     for (auto& view : m_WebViews)
     {
         view->UpdateTexture();