[Webkit-unassigned] [Bug 219445] Changing transforms on layer-backed elements with large subtrees can be incredibly slow
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Mon Dec 7 11:01:11 PST 2020
https://bugs.webkit.org/show_bug.cgi?id=219445
--- Comment #3 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Not quite sure what's going on in the testcase, but sampling shows it spending a lot of time in:
+ 2724 WebCore::Document::resolveStyle(WebCore::Document::ResolveStyleType) (in WebCore) + 1243 [0x7fff3abe28db]
+ 2724 WebCore::Document::updateRenderTree(std::__1::unique_ptr<WebCore::Style::Update const, std::__1::default_delete<WebCore::Style::Update const> >) (in WebCore) + 180 [0x7fff3abe23a4]
+ 2724 WebCore::RenderTreeUpdater::commit(std::__1::unique_ptr<WebCore::Style::Update const, std::__1::default_delete<WebCore::Style::Update const> >) (in WebCore) + 2388 [0x7fff3b67f774]
+ 2724 WebCore::RenderTreeUpdater::updateElementRenderer(WebCore::Element&, WebCore::Style::ElementUpdate const&) (in WebCore) + 87 [0x7fff3b680d57]
+ 2723 WebCore::RenderTreeUpdater::tearDownRenderers(WebCore::Element&, WebCore::RenderTreeUpdater::TeardownType, WebCore::RenderTreeBuilder&) (in WebCore) + 491 [0x7fff3b68267b]
+ ! 2721 WebCore::RenderTreeUpdater::tearDownRenderers(WebCore::Element&, WebCore::RenderTreeUpdater::TeardownType, WebCore::RenderTreeBuilder&)::$_2::operator()(unsigned int) const (in WebCore) + 787 [0x7fff3b682d13]
+ ! : 2706 WebCore::RenderTreeBuilder::destroyAndCleanUpAnonymousWrappers(WebCore::RenderObject&) (in WebCore) + 286 [0x7fff3b6732be]
+ ! : | 2706 WebCore::RenderTreeBuilder::removeAnonymousWrappersForInlineChildrenIfNeeded(WebCore::RenderElement&) (in WebCore) + 593,128,... [0x7fff3b672f31,0x7fff3b672d60,...]
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