http://bugs.winehq.org/show_bug.cgi?id=27298
--- Comment #32 from TestSubject sirbubbles01@gmail.com 2013-02-06 22:09:09 CST --- After running the witcher 2 under windows 8, I can honestly say the performance difference is like night and day, it is perfectly smooth under win8. I have an amd 955 cpu (quad core, 3 ghz per core), 12 gigs of ram, and an nvidia 660 video card. It can run really badly under wine, for example, there is one scene in a quest called "the eternal battle", where you are taking part in a battle between ghosts or something, and there are flaming arrows being used. The game slows to a crawl at that point, but runs smoothly under windows. Might be some graphical stuff that's not properly implemented.
Note that under windows 8, I have everything enabled, including Ubersampling, SSAO, anti-aliasing, the lot.