http://bugs.winehq.org/show_bug.cgi?id=7817
------- Additional Comments From damjan.jov@gmail.com 2007-28-03 05:23 ------- Type glxinfo | grep rendering in a terminal
It should say: direct rendering: Yes
Also, when last I checked, SiS graphics cards didn't have a good reputation on Linux. It could well be a buggy graphics driver, try a different version.