[Webkit-unassigned] [Bug 255597] New: Jank / lag with scroll linked WebGL animations.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255597

            Bug ID: 255597
           Summary: Jank / lag with scroll linked WebGL animations.
           Product: WebKit
           Version: Safari 16
          Hardware: iPhone / iPad
                OS: iOS 16
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: supermoos at gmail.com
                CC: simon.fraser at apple.com

Created attachment 465962

  --> https://bugs.webkit.org/attachment.cgi?id=465962&action=review

iphone_14_pro_ios_16_4_1_recorded with another phone_laggy_jank-1

Somewhere between iOS 15.3.1 and 16+ scroll linked animations in WebGL became laggy / janky.

This demo should easily run 60 fps on an iPhone 14 Pro, however it's not able to.

Weirdly the issue goes away if screenrecording the issue, therefor I've attached multiple videos. Both screenrecording and another phone recording the iPhone 14 Pro.

An iPhone SE running 15.3.1 does not exhibit this issue.

Is it perhaps ProMotion related?

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