Some devices have refresh rates that are not 60fps (like ProMotion @ 120Hz), and run requestAnimationFrame at that speed. Meanwhile MotionMark has hardcoded 60fps everywhere.
<rdar://problem/99416135>
Pull request: https://github.com/WebKit/WebKit/pull/3903
Committed 254133@main (4b28b98d3730): <https://commits.webkit.org/254133@main> Reviewed commits have been landed. Closing PR #3903 and removing active labels.
Re-opened since this is blocked by bug 260215
Fixing via https://github.com/WebKit/MotionMark/pull/21