RESOLVED FIXED309888
[GTK][WPE] Non-composited mode renders more than 1 frame per vblank 
https://bugs.webkit.org/show_bug.cgi?id=309888
Summary [GTK][WPE] Non-composited mode renders more than 1 frame per vblank
Pawel Lampe
Reported 2026-03-13 03:57:42 PDT
When main loop is busy for at least few vblanks, once it unblocks, it's possible that Non-composited frame renderer will draw 2 frames between vblank notifications. This is because vblank notifications may pile up on the event loop in web process and won't get drained immediately as non-composited renderer may immediately start rendering instead - just after processing a first vblank notification from the queue. See: https://scony.github.io/web-examples/misc/stuttering-raf-loop.html
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Pawel Lampe
Comment 1 2026-03-13 04:10:30 PDT
Pull request: https://github.com/WebKit/WebKit/pull/60551
EWS
Comment 2 2026-03-13 05:23:19 PDT
Committed 309199@main (24e3f79f3812): <https://commits.webkit.org/309199@main> Reviewed commits have been landed. Closing PR #60551 and removing active labels.
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