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Open attached example (http://code.google.com/p/chromium/issues/attachmentText?id=139552&aid=1395520000000&name=test.html&token=_zfslVPKMGj56AZt5m4QuCjHpJ0%3A1345659739164) and press "Highlight" button 2x

It takes around 791ms on my machine (i7 2.8) where in Chrome 15 it only takes 30ms. 

Now press the "Collapse selection before syntax highlight" which calls: window.getSelection().collapse() before it assigns new innerHTML. When selection is collapsed I get around 30ms. Chrome 15 is around 30-40ms in both cases (slightly better when not checked)

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