[Webkit-unassigned] [Bug 234923] rAF on iOS 15.2 sometimes seems to lose connection to v-sync signal and runs at < 60 fps

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=234923

--- Comment #2 from Simon Taylor <simontaylor1 at ntlworld.com> ---
(In reply to Alexey Proskuryakov from comment #1)
> Thank you for the report! Could you please confirm if this issue is new in
> iOS 15.x, or if it affected earlier versions too?

I think it's a 15.x regression - I can't reproduce on a 14.8.1 iPhone 12 mini.

100% reproducible on iPhone 12 Pro and iPod touch 7th gen, both on 15.2. I don't have any devices on other 15.x releases I'm afraid.

In terms of relation to Bug 235114 - they are distinct, but both hinting at issues on tabs becoming foregrounded.

If you go back and forth to the demo on that page, you can repro this bug too. Note in "normal" case the rAF loop is < 60 FPS on the Bug 235114 demo page though - that's on purpose to trigger high clocks and keep the CPU busy. So that demo is typically 50 FPS unless this bug is also in play, when it'll drop to 25 FPS.

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