http://bugs.winehq.org/show_bug.cgi?id=14038
--- Comment #62 from Frank Roscher onety-three@gmx.net 2008-07-29 02:59:31 --- (In reply to comment #61) I can confirm your results using virtual desktop (either the nVidia drivers or my monitor suck, I'll need to create custom modelines for the other resolutions)
I just noticed I still had ORM=fbo and GLSL=disabled... switching to ORM=backbuffer fixes the performance problems with medium postprocessing, switching to GLSL=enabled makes the postprocessed scenes (plus Max in normal scenes) solid colored again.
It's quite a mess, splitting up into different bug reports would probably be a good idea.