NEW 92697
RenderObject needs a fast-path for removeAllChildren 
https://bugs.webkit.org/show_bug.cgi?id=92697
Summary RenderObject needs a fast-path for removeAllChildren
Eric Seidel (no email)
Reported 2012-07-30 17:44:33 PDT
RenderObject needs a fast-path for removeAllChildren Looking at the sample of the benchmark attached to bug 92258. We see nearly 10% of total time (on a 300x300 grid sample), spent under ContainerNode::removeChildren() tearing down the associated rendering tree. Each renderer goes through and tell its ancestor chain that it's dying, and marks the view as needing repaint for its rect. We spend a bunch of time computing those repaint rects, and walking up/down the ancestor chain. Just like how we have a "fast path" for removing subtrees in the DOM, we need some smarter logic for removing subtrees in the rendering tree. At least in the non-positioned, flow cases, we should be able to have a single repaint rect instead of all this nonsense.
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