[Webkit-unassigned] [Bug 61239] New: Unbearably slow performance on MinGW-w64

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=61239

           Summary: Unbearably slow performance on MinGW-w64
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows 7
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: net147 at gmail.com


If you compile QtWebKit (either part of Qt 4.7.3 or QtWebKit 2.2 branch) with MinGW-w64, performance is really slow.
Acid 3 test takes a long time to run.
If you middle-click to switch to auto-scroll, it takes 1 second for the mouse cursor to change.
If you move mouse up or down when auto-scroll is enabled, the page scrolls with a delay of 1 second. It updates, pauses for a second, updates, pauses for a second, updates, etc.
JavaScript animations are really slow (e.g. http://jquery.malsup.com/cycle/).

Performance is fine on MinGW GCC 4.4.0 (32-bit).
MinGW-w64 compiler is MinGW-w64 GCC 4.5.2 tdm64-1 from http://tdm-gcc.tdragon.net/.

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