[Tiwaz]

I'd recommend going into Snowy Park and look up to the trees. Adjust your display settig (detail, textures, resolution, colour depth and stuff) settings to an FPS rate of above 20, and you'll do fine in all the other maps.

I'm talking AA here, Spearhead is a different story. Make sure you hear some firing of weapons while adjusting. In my experience, FPS drops when sounds are played, especially with onboard soundcards. Use a PCI soundcard if you have one.