http://bugs.winehq.org/show_bug.cgi?id=22730
--- Comment #5 from Wylda wylda@volny.cz 2010-05-17 04:15:08 ---
Did you activate "Hardware Acceleration" in-game? I forgot to mention that it is only with this activated the problem occurs.
Yes, everything checked in Graphics Options, including Hardware Acceleration.
Some measurement by "WINEDEBUG=+fps wine DKII.exe" gives me cca 85 fps.
I would guess - ATI driver bug? Also in bug 22643 someone complains about poor performance in game menu, which i don't see. Any chance for you to try older wine like 1.1.20 (bug 22643 claims that this one does not suffer from the performance problem).