Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 56629df9968367e0bfb2f2fec31c58c0d57d6a2c
https://github.com/WebKit/WebKit/commit/56629df9968367e0bfb2f2fec31c58c0d57d6a2c
Author: Ryosuke Niwa <[email protected]>
Date: 2026-03-16 (Mon, 16 Mar 2026)
Changed paths:
M Source/WebCore/page/ResizeObserver.cpp
M Source/WebCore/page/ResizeObserver.h
Log Message:
-----------
ResizeObserver::observeInternal can be slow when there are lot of observed
nodes
https://bugs.webkit.org/show_bug.cgi?id=309984
Reviewed by Chris Dumez.
ResizeObserver::observeInternal can be slow when m_observations is large since
it does a linear search of the target in m_observations.
Since we tend to have a lot more elements than ResizeObservers, do the reverse
search in ResizeObserverData of the target first.
No new tests since there should be no observable behavior changes besides perf.
* Source/WebCore/page/ResizeObserver.cpp:
(WebCore::ResizeObserver::observationForElement): Added.
(WebCore::ResizeObserver::observeInternal):
(WebCore::ResizeObserver::resetObservationSize):
* Source/WebCore/page/ResizeObserver.h:
Canonical link: https://commits.webkit.org/309334@main
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