[Webkit-unassigned] [Bug 57571] New: Lots of calls to computeRectForRepaint() when doing layout on cnn.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=57571

           Summary: Lots of calls to computeRectForRepaint() when doing
                    layout on cnn.com
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
               URL: http://cnn.com
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com
                CC: jamesr at chromium.org


When cnn.com does layout, there are a lot of calls to RenderBox::computeRectForRepaint(), via RenderLayer::updateLayerPositions(). It's inefficient for the following reasons:

1. We don't track whether any layers actually changed, so we may not actually have to do any work
2. We're walking down the RenderLayer tree, but for each layer walking back up the renderers doing computeRectForRepaint(), so it's > O(N)

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