[Webkit-unassigned] [Bug 102585] New: Performance degradation while rendering MathML content, freezes the tab.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=102585

           Summary: Performance degradation while rendering MathML
                    content, freezes the tab.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows 7
            Status: UNCONFIRMED
          Severity: Critical
          Priority: P1
         Component: MathML
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ancil0504 at gmail.com
                CC: dbarton at mathscribe.com


Created an attachment (id=174814)
 --> (https://bugs.webkit.org/attachment.cgi?id=174814&action=review)
Test Page 1

There is a performance degradation on latest Chrome Canary builds and Webkit Nightly builds(WebKit-r131444) while rendering MathML content.
Verified on older nightly builds and found that after change set r128837 (Mathml to use flexboxes) the issue is seen.

 Findings below

 WebKit-r128813: Test page 1 & 2 works well on WinLauncher and Webkit.exe

 WebKit-r128857/WebKit-r131444: Test page 1 - Renders after a perceivable  delay in WinLauncher and Webkit.exe
                                Test page 2 - Both Winlauncher & Webkit.exe freezes/hangs

 Chrome Canary Version 25.0.1326.0 canary: Test page 1 - Renders after a perceivable  delay.
                                          Test page 2 - Application freezes/hangs and after sometime shows 'Page unresponsive' pop-up.

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