http://bugs.winehq.org/show_bug.cgi?id=10400
--- Comment #4 from H. Verbeet hverbeet@gmail.com 2007-11-12 11:21:53 --- (In reply to comment #3)
So which part of the multi-gigabyte logs that Wine can produce can answer that question?
Logs probably won't help much here since it's a performance issue, but if there's anything to see in the logs likely places would be anything generated inside apply_fbo_state() or depth_copy() (you could try disabling depth_copy() completely, although I doubt it'll make much of a difference). In general you'd want to narrow things down to a specific FBO configuration that causes the slowdown like a specific texture format or active render states.
I tried to reset all the video configuration I could find. And remove any HW cards that might have anything to do with this. Still no go.
AFAIK FBOs should work with my card and caps show that.
A 6600GT should support FBOs just fine. The only other difference with my setup that I see that could be significant is the amount of video memory.