[Webkit-unassigned] [Bug 67581] REGRESSION: toggling display of lots (thousands) of elements with display:none is very slow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=67581





--- Comment #4 from Antti Koivisto <koivisto at iki.fi>  2011-09-08 11:39:45 PST ---
Sample showing it spending time under WebCore::NodeRenderingContext::nextRenderer():

Call graph:
    2483 Thread_37033   DispatchQueue_1: com.apple.main-thread  (serial)
    + 2483 ???  (in Safari)  load address 0x109e36000 + 0xf24  [0x109e36f24]
    +   2483 SafariMain  (in Safari) + 197  [0x7fff955e4725]
    +     2483 NSApplicationMain  (in AppKit) + 867  [0x7fff90e7652a]
    +       2483 -[NSApplication run]  (in AppKit) + 548  [0x7fff90bf842b]
    +         2483 -[BrowserApplication sendEvent:]  (in Safari) + 822  [0x7fff9543247a]
    +           2483 -[NSApplication sendEvent:]  (in AppKit) + 5665  [0x7fff90c61f19]
    +             2483 -[BrowserWindow sendEvent:]  (in Safari) + 378  [0x7fff954897e8]
    +               2483 -[Window sendEvent:]  (in Safari) + 115  [0x7fff956820c5]
    +                 2483 -[NSWindow sendEvent:]  (in AppKit) + 6478  [0x7fff90cc9734]
    +                   2483 -[WebHTMLView mouseUp:]  (in WebKit) + 223  [0x10a24347f]  WebHTMLView.mm:3639
    +                     2483 WebCore::EventHandler::mouseUp(NSEvent*)  (in WebCore) + 206  [0x10acbc39e]  EventHandlerMac.mm:527
    +                       2483 WebCore::EventHandler::handleMouseReleaseEvent(WebCore::PlatformMouseEvent const&)  (in WebCore) + 1024  [0x10acb6b50]  EventHandler.cpp:1717
    +                         2483 WebCore::EventHandler::handleMouseReleaseEvent(WebCore::MouseEventWithHitTestResults const&)  (in WebCore) + 618  [0x10acb343a]  EventHandler.cpp:760
    +                           2483 WebCore::FrameSelection::notifyRendererOfSelectionChange(WebCore::EUserTriggered)  (in WebCore) + 39  [0x10ad156c7]  FrameSelection.cpp:1690
    +                             2483 WebCore::Document::updateStyleIfNeeded()  (in WebCore) + 67  [0x10aba5253]  Document.cpp:1621
    +                               2483 WebCore::Document::recalcStyle(WebCore::Node::StyleChange)  (in WebCore) + 459  [0x10aba446b]  Document.cpp:1564
    +                                 2483 WebCore::Element::recalcStyle(WebCore::Node::StyleChange)  (in WebCore) + 2378  [0x10aca705a]  Element.cpp:1161
    +                                   2483 WebCore::Element::recalcStyle(WebCore::Node::StyleChange)  (in WebCore) + 2378  [0x10aca705a]  Element.cpp:1161
    +                                     2483 WebCore::Element::recalcStyle(WebCore::Node::StyleChange)  (in WebCore) + 2378  [0x10aca705a]  Element.cpp:1161
    +                                       2483 WebCore::Element::recalcStyle(WebCore::Node::StyleChange)  (in WebCore) + 2378  [0x10aca705a]  Element.cpp:1161
    +                                         2483 WebCore::Element::recalcStyle(WebCore::Node::StyleChange)  (in WebCore) + 653  [0x10aca699d]  Node.h:761
    +                                           2473 WebCore::Element::attach()  (in WebCore) + 101  [0x10aca5d35]  Element.cpp:974
    +                                           ! 2464 WebCore::Node::attach()  (in WebCore) + 79  [0x10b277f7f]  Node.cpp:1464
    +                                           ! : 2435 WebCore::NodeRendererFactory::createRendererIfNeeded()  (in WebCore) + 122  [0x10b281b6a]  NodeRenderingContext.cpp:349
    +                                           ! : | 1703 WebCore::NodeRenderingContext::nextRenderer() const  (in WebCore) + 270  [0x10b28151e]  Node.h:437
    +                                           ! : | 343 WebCore::NodeRenderingContext::nextRenderer() const  (in WebCore) + 287  [0x10b28152f]  NodeRenderingContext.cpp:184
    +                                           ! : | + 343 WebCore::Node::isContentElement() const  (in WebCore) + 0,6,...  [0x10aa42530,0x10aa42536,...]  Node.h:215
    +                                           ! : | 333 WebCore::NodeRenderingContext::nextRenderer() const  (in WebCore) + 278,287,...  [0x10b281526,0x10b28152f,...]  NodeRenderingContext.cpp:184
    +                                           ! : | 56 WebCore::NodeRenderingContext::nextRenderer() const  (in WebCore) + 251,255  [0x10b28150b,0x10b28150f]  Node.h:151
    +                                           ! : 27 WebCore::NodeRendererFactory::createRendererIfNeeded()  (in WebCore) + 133  [0x10b281b75]  NodeRenderingContext.cpp:350

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