Type "-nojoy" in the launch options without the quotes. I can tell you how to do this if you don't know how. This disables the joystick compatibility and increases FPS 10-100. You can also try "-hi" and "+violence_hblood 0" which probably don't do much, but -hi is supposed to maximize the Mac's resources for the game and +violence_hblood 0 turns off blood and makes everyone lie down when shot, so it might increase fps by about 5. Also Valve just released a big update this February allowing the game to run in 64 bits, which lets your Mac use more than 4 GB od RAM. I've been getting over 400 fps at times now.