http://bugs.winehq.org/show_bug.cgi?id=10300
--- Comment #5 from Roderick Colenbrander thunderbird2k@gmx.net 2007-11-04 09:04:12 --- Actually the problem you are seeing is in essence not a regression but on the other hand it is.
The game uses pbuffers for some rendering some parts. Without the patch it actually failed to create a pbuffer (due to wine's pixel format limitations). Since the patch it is finding a pixel format and actually uses a pbuffer. But for some reason it is finding a very, very bad pixel format which causes the performance problems (it is using a 128-bit pixel format).