The video card is pretty slow. Even if it has a decent driver (S3, which was acquired by VIA, probably, doesn't support this chip any longer), it's so slow, that you'll get rather slow FPS.
Upgradeing to a decent GeForce2-class card will improve the performance 100x.
Take a look at refurbished section of www.newegg.com . I've bought a zippy GeForce2 GTS card for $49.