Yeah. Unfortunately there's no magic tweaks to up your FPS. IIRC there's a few things you can alter in your config to gain a few FPS, though it kinda makes stuff look like crap.
You can also run the game with an altered dx9 file.
OC your RAM/CPU and you should gain a few FPS, but that's about all you can do. The engine's so bad it's not even funny.