[Webkit-unassigned] [Bug 94733] New: 2400% performance regression when performing innerHTML in contentEditable/designMode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=94733

           Summary: 2400% performance regression when performing innerHTML
                    in contentEditable/designMode
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: InChromiumBugs, NeedsRadar, NeedsReduction
          Severity: Normal
          Priority: P2
         Component: HTML Editing
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: ojan at chromium.org, arv at chromium.org, enrica at apple.com,
                    haraken at chromium.org


>From http://code.google.com/p/chromium/issues/detail?id=139552

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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