http://bugs.winehq.org/show_bug.cgi?id=29079
--- Comment #21 from Gediminas Jakutis gediminas@varciai.lt 2013-02-27 04:22:14 CST --- (In reply to comment #20) Before You start suspecting this bug is back: how's Your CPU configured?
SSHD does not do well with power saving features and is highly CPU bottlenecked. Unless I force my CPU to the highest power state, the performance is underwhelming. Meanwhile, if I overclock my CPU enough, it runs as fast as ~75% native's performance, where it starts getting GPU bound.
P.S. This engine does not do well with Linux's power saving && core switching logic when run natively [as SS3] and that makes the game run much slower. The engine parts that suffer from this are unchanged between SSHD and SS3. Thus, it's logical it suffers from this even when there's Wine involved. Source: a chat with a dev from Croteam.