http://bugs.winehq.org/show_bug.cgi?id=17956
--- Comment #26 from Emmanuel Anne emmanuel.anne@gmail.com --- (In reply to comment #25)
Is this still an issue in Wine 1.7.10 or later?
Well after quickly testing an old bg2 installation I have in a corner, it seems to run better than before at least. I am not totally sure it runs as well as it should in windows, but it's hard to say since this game is heavily moded, it would require more than a quick test with some comparison in native windows.
My impression is that it's better, but still slower than native windows.