[Webkit-unassigned] [Bug 232374] New: iPhone landscape animations lags

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=232374

            Bug ID: 232374
           Summary: iPhone landscape animations lags
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: roland at nextendweb.com

Created attachment 442579

  --> https://bugs.webkit.org/attachment.cgi?id=442579&action=review

Screencapture

Steps to reproduce:
1. Rotate your iPhone to landscape orientation
2. Open https://smartslider3.com/bugs/webkit/bganimlag/
3. Swipe left and right to trigger the animation

What's went wrong?
Animation lags and sometime the page crashes and reloads. Also phone starts to getting hot, probably CPU is working really hard.


In portrait orientation everything is fine and smooth.

Able to reproduce on IOS 14.5 and IOS 15.0.2

See attached screencapture.mov

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