- From: Sami Kyostila <skyostil@google.com>
- Date: Tue, 4 Aug 2015 15:15:35 +0100
- To: public-web-perf@w3.org
In Blink we're considering to stop requestAnimationFrame callbacks for documents which aren't visible[1]. This is to avoid overhead from animations inside iframes that are outside the root viewport. Gecko has recently implemented a similar optimization[2]. Has anyone else looked into something like this? I saw some earlier threads about extending Page Visibility[3] to take the viewport into account, but the scope of that change is a little larger than what we're proposing. The obvious compatibility risk is breaking pages that rely on an out-of-view rAF to function. We're trying to avoid that by only throttling cross-origin iframes -- with the hope that since there's no synchronous way to observe rAF callbacks in those frames, sites are less likely to rely on their timing. Does that sound reasonable? Thanks, - Sami [1] https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/_SRHebxivJs [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1145439 [3] https://lists.w3.org/Archives/Public/public-whatwg-archive/2015Mar/0229.html
Received on Wednesday, 5 August 2015 21:40:29 UTC