[Webkit-unassigned] [Bug 47447] New: The layout timer throttles HTML animation performance

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=47447

           Summary: The layout timer throttles HTML animation performance
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
               URL: http://themaninblue.com/experiment/AnimationBenchmark/
                    html/
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com
                CC: hyatt at apple.com, mitz at webkit.org, sam at webkit.org


Some analysis of this benchmark <http://themaninblue.com/experiment/AnimationBenchmark/html/> shows that the FPS meter on the page does not reflect the reality of how rapidly the view is updated.

After some poking around, it turns out that the layout timer is throttling the layout rate. The WebView draws at only about half the framerate that the test reports. This causes this animation to be noticeably chunkier than the canvas version of the same test.

CSS animations may get throttled in the same way.

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