[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 #3 from Liam DeBeasi <ldebeasi at gmail.com> ---
Another observation I made is that the iPhone 11 timeline shows significantly more frames taking >1ms than the iPhone 7 timeline.

It doesn't look like Safari exported the details of what's happening in each frame, but upon re-running my initial tests, it looks like the frames taking >1ms have a) Touch Move Event Dispatched and b) Styles Recalculated. This is expected; however, the iPhone 11 timeline showing more >1ms frames than the iPhone 7 timeline seems odd. If anything, I would expect the iPhone 7 timeline to have more >1ms given that the iPhone 11 is a more powerful device.

I'm not sure that 1-2ms frames would contribute to this much of a performance difference, but as of now it's the only noticeable difference I can see in the timeline between the iPhone 11 and iPhone 7 tests.

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