[Webkit-unassigned] [Bug 84393] Avoid calling updateCompositingLayers() more than once before each render

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=84393





--- Comment #4 from Simon Fraser (smfr) <simon.fraser at apple.com>  2012-04-19 18:11:36 PST ---
Just saw this when scrolling macnn.com, via JS calling pageYOffset.

Lots of time in

        absBounds = layer->renderer()->localToAbsoluteQuad(FloatRect(layer->localBoundingBox())).enclosingBoundingBox();

under RenderLayerCompositor::computeCompositingRequirements().

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