[Webkit-unassigned] [Bug 242183] New: Janky motion path animation in STP 148 / MacBook Pro with ProMotion

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=242183

            Bug ID: 242183
           Summary: Janky motion path animation in STP 148 / MacBook Pro
                    with ProMotion
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Apple Silicon)
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tho22 at apple.com
            Blocks: 203847

Bug is reported here https://github.com/WebKit/WebKit/pull/806#issuecomment-1170759817. 

Animation is very janky on a MacBook Pro with M1 Max and ProMotion. The animation becomes even more janky when ProMotion is turned off and the refresh rate is set to 60hz fixed. Issue doesn't occur on WebKit 614.1.19 on a M1 MacBook Pro (no ProMotion, fixed 60hz refresh rate), so I believe this has something to do with the variable refresh rate.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=203847
[Bug 203847] Master bug: Motion path/Offset spec
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