User:Jdm/SlowCSSSelectors

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Revision as of 22:45, 13 March 2012 by Jdm (talk | contribs)
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https://developer.mozilla.org/en/Writing_Efficient_CSS

http://mxr.mozilla.org/mozilla-central/source/layout/style/nsCSSRuleProcessor.cpp

http://mxr.mozilla.org/mozilla-central/source/layout/style/nsCSSRuleProcessor.h

http://mxr.mozilla.org/mozilla-central/source/layout/style/StyleRule.h

http://mxr.mozilla.org/mozilla-central/source/layout/style/StyleRule.cpp

http://mxr.mozilla.org/mozilla-central/source/layout/style/nsNthIndexCache.cpp

http://mxr.mozilla.org/mozilla-central/source/layout/style/nsNthIndexCache.h


Functions like SelectorMatches show up in C++ profiles when CSS selector matching is being a problem. However, that is too low level - individual calls of SelectorMatches are fast, but the sheer volume of calls causes the problem. Instead, RuleHash is used to avoid even looking at most selectors.

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