What is 'low'? First decide if its 'bad' or somewhat 'normal'.
I have a strange pattern of performance in the ut2k3 engine, and games based on it. The engine seems to be highly cpu dependent, with ~10 fps gain or loss from max texture / resolution settings down to min texture / resolution. I range from 5 - 30 fps during fly-by benchmarks.
Ge 4 ti4400, P4 2.0a on i850e chipset at 4xAGP, 512mb rdram
no difference in using agpgart vs nvagp.
Americas ArmyOps runs ~10 to 30fps on large outdoor maps, 50 - 70fps on smaller urban maps.
In ut2k3 console: stat fps
I did have a significant improvement in performance (it was worse!) from compiling alsa from cvs and replacing the sound module installed by the game. This is mentioned in the ut2k3 release faq.
"..the triumph of evil is for good men to do nothing."
VIDIA video driver RPMs for Fedora
:: see yum repo at livna.org