[Webkit-unassigned] [Bug 205454] Poor gesture-based animation performance on fullscreen/"notch" iPhones

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205454

--- Comment #5 from Liam DeBeasi <ldebeasi at gmail.com> ---
I put together another demo that tests my theory that this issue is related to touchevents/pointerevents being throttled.

I linked up the same animation to a scroll event instead of a touch/pointer event, and the animation was a perfect 60fps throughout. If the root issue was with the animation, I would have expected to see the jank here too.

Steps to reproduce:

1. Open https://codepen.io/liamdebeasi/full/ExjgGJb on a "notch" iPhone.
2. Scroll up and down the page. The blue square should animate across the screen.
3. You should notice that when scrolling, the animation is a smooth 60fps throughout.

Full code: https://codepen.io/liamdebeasi/pen/ExjgGJb

Together with my previous comment about the canvas animations + slider, the issue seems to reside with touch/pointer events being throttled.

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