http://bugs.winehq.org/show_bug.cgi?id=22528
--- Comment #7 from Henri Verbeet hverbeet@gmail.com 2010-04-30 04:33:55 --- (In reply to comment #6)
dx10-class GPUs like a radeon hd3450 and a Geforce GTS360. The patch fixed an actual bug and I guess this code (FBO stuff) is not efficient on older GPUs, so the issue might not be solvable and I'm keeping the bug as a place holder.
The performance regression makes perfect sense actually, and I'm seeing it here as well in multiple applications on a GF 9600M.