[Webkit-unassigned] [Bug 82646] [chromium] Idle painting is not sufficient to pre-paint animated layers and delay animation start time

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=82646





--- Comment #4 from Eric Penner <epenner at chromium.org>  2012-03-30 18:13:15 PST ---
> 
> Either way, I expect that this will become a non-issue once he fixes the synchronization issues we're seeing when main thread commits. And if it's the way I think we'll fix it, then we will be far better off starting the animation as fast as possible and prepainting non-visible stuff to try catch up after the first commit.

Sounds like a great find! 

I'm pretty convinced this is still an issue based on the early experiment I did, but we can see how things pan out. As an example to illustrate why I'm still convinced we need to do some work upfront: I've seen some transitions where the work required (painting and uploads), takes 1.5x the length of the subsequent animation. I'll dig up a trace to illustrate further.

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