Comment 3 for bug 788102
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0e1f616
(Get the code!)
Scrolling the main GMail window is slow. It should be super fast.
One issue is that the GMail window contains an IFRAME with all the actual content. That IFRAME's viewport scrollframe is not always active, we only activate it on a timer. So when you scroll, it's flipping between active and inactive a lot, which forces repainting of the entire window a lot.
So there's a few things we could do:
1) Increase the scroll activity timeout so we don't flip between active and inactive while scrolling. In selected cases we could make the timeout infinite.
2) Item 1 means we'll be displaying non-subpixel-AA text for longer, so we should fix that for as many cases as possible (including GMail) by detecting when a transparent ThebesLayer has a solid color behind it, and making the ThebesLayer opaque with that background color. That will also speed up drawing and compositing.