[Webkit-unassigned] [Bug 119178] New: Layout operation for text in certain languages is very slow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=119178

           Summary: Layout operation for text in certain languages is very
                    slow
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: http://codepen.io/jniemasik/pen/Jtsrj
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: niemasik at gmail.com


Open the inspector and profile layout operations.
- With English or Chinese text shown (the text moves so that it is constantly repainted), layout ops are fast.
- Switch to Hindi and record again. Layout ops are much slower.

Many languages lay out quickly (on my machine, < 1ms), but certain sets of characters take a long time (5 to 30ms).

That's for a very small amount of text. I noticed this first with Thai and saw it with Hindi text, as in the example.

[Note: I'm using the WebKit inspector to get those numbers, only because I'm more familiar with it.]

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