[Webkit-unassigned] [Bug 60885] New: Performance degradation for text rendering

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=60885

           Summary: Performance degradation for text rendering
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: scraciun at adobe.com


Created an attachment (id=93642)
 --> (https://bugs.webkit.org/attachment.cgi?id=93642&action=review)
Test case. The displayed framerate drops by 20% when applying changeset #57215.

The performance degradation occurs when updating from Safari-6531.9 to Safari-533.19.4. It seems to have been injected with changeset 57215 in InlineTextBox::setFallbackFonts, which seems to roughly double the number of calls to malloc. The performance is approximatively 20% lower. Comparing the current trunk version with  Safari-6531.9, the performance degradation is still there.

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