[Webkit-unassigned] [Bug 239488] WinCairo WebKit2 significant performance regression

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239488

--- Comment #2 from Fujii Hironori <Hironori.Fujii at sony.com> ---
(In reply to Fujii Hironori from comment #1)
> Disabling GPU process doesn't seem to work around this issue.
> 
> > reg add HKEY_CURRENT_USER\Software\WebKit /v gpu_process_canvas_rendering /t REG_DWORD /d 0 /f
> > reg add HKEY_CURRENT_USER\Software\WebKit /v gpu_process_webgl /t REG_DWORD /d 0 /f

This was wrong. These flags were removed.
  Bug 238766 – Remove GPU process system feature flags

I think there is no good way to disable GPU process for WinCairo. I applied the following patch to disable GPU process, and confirmed it worked around the issue.

diff --git a/Source/WebKit/UIProcess/WebPageProxy.cpp b/Source/WebKit/UIProcess/WebPageProxy.cpp
index 257a744f94c2..37daefef8ca3 100644
--- a/Source/WebKit/UIProcess/WebPageProxy.cpp
+++ b/Source/WebKit/UIProcess/WebPageProxy.cpp
@@ -8455,14 +8455,14 @@ WebPageCreationParameters WebPageProxy::creationParameters(WebProcessProxy& proc
     // FIXME: This is also being passed over the to WebProcess via the PreferencesStore.
     parameters.shouldCaptureVideoInGPUProcess = preferences().captureVideoInGPUProcessEnabled();
     // FIXME: This is also being passed over the to WebProcess via the PreferencesStore.
-    parameters.shouldRenderCanvasInGPUProcess = preferences().useGPUProcessForCanvasRenderingEnabled();
+    parameters.shouldRenderCanvasInGPUProcess = false;
     // FIXME: This is also being passed over the to WebProcess via the PreferencesStore.
     parameters.shouldRenderDOMInGPUProcess = preferences().useGPUProcessForDOMRenderingEnabled();
     // FIXME: This is also being passed over the to WebProcess via the PreferencesStore.
     parameters.shouldPlayMediaInGPUProcess = preferences().useGPUProcessForMediaEnabled();
 #if ENABLE(WEBGL)
     // FIXME: This is also being passed over the to WebProcess via the PreferencesStore.
-    parameters.shouldRenderWebGLInGPUProcess = preferences().useGPUProcessForWebGLEnabled();
+    parameters.shouldRenderWebGLInGPUProcess = false;
 #endif

     // FIXME: This is also being passed over the to WebProcess via the PreferencesStore.

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