[Webkit-unassigned] [Bug 94734] New: REGRESSION: Editing slows down at the end of a content editable area

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=94734

           Summary: REGRESSION: Editing slows down at the end of a content
                    editable area
           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: ap at webkit.org, enrica at apple.com


http://code.google.com/p/chromium/issues/detail?id=139557

Open attached file (http://code.google.com/p/chromium/issues/attachmentText?id=139557&aid=1395570000000&name=test.html&token=BDo-xSqQx8ZZvq5Khvw7tNR7K7Y%3A1345659861861), scroll down and start editing. All editing operations such as typing, selecting or pasting become very slow(tested on i7 2nd gen 2.8) Pasting whole text become even unresponsive and require closing whole tab. 

Note that Chrome 16 works as expected considering size of this file. 

FPS stats (https://github.com/mrdoob/stats.js) show as low as 0 frames per second when typing at the bottom of the document and 59 when typing at the top.

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