well, i noticed massive drops in framerate when playing with larger number (say 5 and up) of other players.
compared to quake 3 or UT there is stull much to improve performancewise..
anyway: maybe it would help to have a console command, to FORCE ONE SINGLE PLAYER MODEL FOR ALL PLAYERS ? (having this a low poly count model would be fine too)
and yes: i already did (and use) any of the other tweaks suggested.
[amd athlon xp 1800, 512mb ram, ati 9200 64mb, win xp.]
[framerate (lowest settings) average 70-40 fps, dropping to 10-20 with more players]