[Chazar]

I'm running it on my Laptop, a Fujitsu-Siemens with not-uptodate ATI Radeon Mobility Graphic.

First it was awfully slow (Battle Frame count was around 2 with even the lowest quality setting, unbearable), both under Linux and WinXP, but those Omega-drivers recommended in that sticky thread really worked: Now I've set quality to the highest value and the frame count is still around 90...

This sounds incredible, but I guess that this is due to the very bad OpenGL support in most (Laptop-)Graphics drivers (eg. ATI in my case, which officially doesnt support the mobility chips).

So try different (third-party) drivers like those Omega-Drivers. Maybe just trying the game with one of those up-to-date Linuxes-from-bootable-CD (Knoppix, etc.) might also be worth a quick try...