turn off aa and you should get 5-6 more fps... you need to run at absolutley minimum settings. you should be able to play at native rez but if your still not getting a minimum of 30 fps then your system isnt up to spec and theres nothing you can do about it. also force dx9 via the games config files.
how to set it to dx9? will it cause the visual to be very bad?
i can run at 40-50 fps ouydoor, but indoor i mostly got 35 fps (don't know why), and drops to a (usually) minimum 15-25 when there is a lot of explosion