[Webkit-unassigned] [Bug 40165] New: Performance slowdown in designMode when editing end of lines

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=40165

           Summary: Performance slowdown in designMode when editing end of
                    lines
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows 7
            Status: UNCONFIRMED
          Severity: Major
          Priority: P2
         Component: HTML Editing
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jaroslav.benc at gmail.com


Created an attachment (id=57879)
 --> (https://bugs.webkit.org/attachment.cgi?id=57879)
example code with designmode switched on

We've got a code editor using designMode to edit files, there is a huge performance slowdown when using Chrome 5 / Chromium 5 so most of files bigger than 20KB become uneditable in the editor. Interesting thing is that it is fine when we type inside of exising line (there are words following the caret) if we type after the last character it becomes slow. 

There is an attachment showing a file example generated as syntax highlighted HTML with designMode switched on. Try to open it in Chrome/Chromium 5 and and start typing, there is a 1s delay when pressing keys on dual core 2.1, bigger file bigger delay. Then try to open this file in Chrome 4 / Chromium 4 / Firefox 3.6 or Safari 4 and see the difference.

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