[Webkit-unassigned] [Bug 113786] Throttle repaints during page loading in tile controller

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=113786





--- Comment #7 from Simon Fraser (smfr) <simon.fraser at apple.com>  2013-04-02 10:25:11 PST ---
(In reply to comment #6)
> (In reply to comment #4)
> > Should we do this for other compositing layers too?
> 
> Probably, though I was going to look into it separately.

Thinking about this more, I think you're adding an unnecessary layer of repaint rect caching. GraphicsLayerCA already has a cache of repaint rects, and there is one for the tile cache layer. We just need to not have GraphicsLayerCA flush those repaint rects down to the TiledBacking, which happens at flush time.

So maybe we should really just throttle compositing layer flushes during page load, which will have the side-effect of throttling repaints.

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