RESOLVED FIXED 139651
Lazily recompute the nonFastScrollableRegion 
https://bugs.webkit.org/show_bug.cgi?id=139651
Summary Lazily recompute the nonFastScrollableRegion
Simon Fraser (smfr)
Reported 2014-12-15 13:53:50 PST
Profiling cssom/non-subpixel-scroll-top-left-values.html is very slow on Yosemite in debug shows 25% of time under: Running Time Self Symbol Name 2310.0ms 28.0% 0.0 WebCore::Element::setInnerHTML(WTF::String const&, int&) 2281.0ms 27.7% 0.0 WebCore::replaceChildrenWithFragment(WebCore::ContainerNode&, WTF::PassRefPtr<WebCore::DocumentFragment>, int&) 2279.0ms 27.7% 0.0 WebCore::ContainerNode::removeChildren() 2277.0ms 27.6% 0.0 WebCore::ContainerNode::removeBetween(WebCore::Node*, WebCore::Node*, WebCore::Node&) 2277.0ms 27.6% 0.0 WebCore::destroyRenderTreeIfNeeded(WebCore::Node&) 2276.0ms 27.6% 0.0 WebCore::Style::detachRenderTree(WebCore::Element&) 2276.0ms 27.6% 0.0 WebCore::Style::detachRenderTree(WebCore::Element&, WebCore::Style::DetachType) 2228.0ms 27.1% 0.0 WebCore::RenderObject::destroyAndCleanupAnonymousWrappers() 2228.0ms 27.1% 0.0 WebCore::RenderObject::destroy() 2220.0ms 27.0% 0.0 WebCore::RenderBlockFlow::willBeDestroyed() 2220.0ms 27.0% 0.0 WebCore::RenderBoxModelObject::willBeDestroyed() 2220.0ms 27.0% 0.0 WebCore::RenderElement::willBeDestroyed() 2220.0ms 27.0% 0.0 WebCore::RenderObject::willBeDestroyed() 2195.0ms 26.6% 0.0 WebCore::RenderLayerModelObject::destroyLayer() 2195.0ms 26.6% 0.0 WebCore::RenderLayer::~RenderLayer() 2193.0ms 26.6% 0.0 WebCore::RenderLayer::~RenderLayer() 2193.0ms 26.6% 0.0 WebCore::RenderLayer::~RenderLayer() 2120.0ms 25.7% 0.0 WebCore::FrameView::removeScrollableArea(WebCore::ScrollableArea*) 2118.0ms 25.7% 0.0 WebCore::FrameView::scrollableAreaSetChanged() 2118.0ms 25.7% 0.0 WebCore::AsyncScrollingCoordinator::frameViewNonFastScrollableRegionChanged(WebCore::FrameView*) 2113.0ms 25.7% 4.0 WebCore::ScrollingCoordinator::computeNonFastScrollableRegion(WebCore::Frame const*, WebCore::IntPoint const&) const 1543.0ms 18.7% 5.0 WebCore::Region::unite(WebCore::Region const&) 1356.0ms 16.4% 2.0 WebCore::Region::Shape::unionShapes(WebCore::Region::Shape const&, WebCore::Region::Shape const&) 1351.0ms 16.4% 15.0 WebCore::Region::Shape WebCore::Region::Shape::shapeOperation<WebCore::Region::Shape::UnionOperation>(WebCore::Region::Shape const&, WebCore::Region::Shape const&) 658.0ms 8.0% 4.0 WebCore::Region::Shape::appendSpan(int, int const*, int const*) We should compute this region lazily.
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Simon Fraser (smfr)
Comment 1 2015-05-01 15:37:32 PDT
Fixed in r182346.
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