[Webkit-unassigned] [Bug 237918] REGRESSION(iOS 15.4): threejs experiencing critical performance issues (flickering, rendering problems)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=237918

--- Comment #7 from Kyle Piddington <kpiddington at apple.com> ---
Hi Anna, I can reproduce your issues on iOS 15.4, and that that after applying the patch athttps://bugs.webkit.org/show_bug.cgi?id=237113 I'm no longer observing flickering and rendering issues. 

(In reply to em_te from comment #5)
> I'm experiencing a flickering bug after upgrading to the latest iOS 15.4 on
> Mobile Safari.
> 
> Click on the box to trigger the "hover" transition. On old Safari the box
> grows and darkens as intended. After the 15.4 update, the animation does a
> flicker at the end of the transition.
> 
> https://jsbin.com/poyafawore/edit?css,output

Em_te, this appears to be a different issue, unfortunately. https://bugs.webkit.org/show_bug.cgi?id=211986 seems more similar to what you're experiencing.

Specifically, I've found the opacity of your element appears to incorrectly 'snap' back to the original opacity, and then immediately transition to the final opacity  once the timer is finished. This issue is very prominent if you set the scale transform to 100ms, instead of 1000. Can you open a new bug for this?

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