Bug 309984

Summary: ResizeObserver::observeInternal can be slow when there are lot of observed nodes
Product: WebKit Reporter: Ryosuke Niwa <rniwa>
Component: New BugsAssignee: Ryosuke Niwa <rniwa>
Status: RESOLVED FIXED    
Severity: Normal CC: webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Bug Depends on:    
Bug Blocks: 309699    

Ryosuke Niwa
Reported 2026-03-15 10:23:12 PDT
ResizeObserver::observeInternal does a linear search on m_observations to find a matching observation. This can get really slow when m_observations is large.
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Ryosuke Niwa
Comment 1 2026-03-15 10:29:02 PDT
Pull request: https://github.com/WebKit/WebKit/pull/60661
EWS
Comment 2 2026-03-16 10:43:04 PDT
Committed 309334@main (56629df99683): <https://commits.webkit.org/309334@main> Reviewed commits have been landed. Closing PR #60661 and removing active labels.
Radar WebKit Bug Importer
Comment 3 2026-03-16 10:44:13 PDT
<rdar://problem/172675175>
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