[Bug 6273] New: Grim Fandango drawing very slowly with coloured overlay

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=6273

Summary: Grim Fandango drawing very slowly with coloured overlay
           Product: Wine
           Version: 0.9.21.
          Platform: Other
               URL: http://www.lucasarts.com/products/grim/
        OS/Version: other
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wine-directx
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Since wine 0.9.16 (i.e. 0.9.15 did not have this error):
Playing the game Grim Fandango, (only possible under X at display depth 16bpp -
see bug 3771):

The game draws extremely slowly, and is overdrawn with a primary colour, or
mixtures of primary colours (colours #00FF00, #FFFF00, etc..).

E.g. intro video overdrawn in green, game engine overdrawn in yellow..
screenshot attached.

This bug appears similar to my 'Thief: The Dark Project' bug, ID 5823