>>> My Info: Win7_64, Nightly 46, 32bit, ID 20160209030347 STR: 1. Open https://gaming.youtube.com/watch?v=gCISR0T3grE 2. Wait until the page is loaded 3. Autoscroll the left block (containing the video) AR: there're very noticeable lags every second ER: No lags, just like on GoogleChrome Note: 1) This behavior is presented on Firefox 36+, and that site doesn't work on earlier versions 2) Probably it'll be fixed with APZ, but sometimes APZ just hides cases when Firefox overuses CPU/RAM, so this still may be useful 3) In Profiler, I see that FPS drops to ~2 when I autoscroll. Actually, it drops to ~2 anyway, no matter if I autoscroll or scroll with mouse option "scroll by 1 page" with APZ enabled/disabled. 4) Actually, when I use profiler in GoogleChrome, I still see that it's being busy, but less than Firefox. It seems that firefox is loosing in requestAnimationFrame performance. So while the bad performance is clearly a fault of gaming.youtube.com developers, that site still may be used as a test case of requestAnimationFrame slowness. Just thinking aloud. Here's approximate screenshot of Profiler for Note (4): > https://dl.dropboxusercontent.com/s/gdlkj80g579dhft/screenshot%201%20-%20Browser%20hangs%20after%20clicking%20on%20a%20specific%20record%20in%20Waterfall.png?dl=0
Component: Panning and Zooming → Layout
>>> My Info: Win7_64, Nightly 49, 32bit, ID 20160526082509 Currently there are no issues with performance on that site. It was fixed on their side, so the site couldn't be used as a testcase.
Status: NEW → RESOLVED
Last Resolved: 2 years ago
Resolution: --- → WORKSFORME
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