Not to be confused with The Prototype.
Prototype on an Nvidia graphics card.
Prototype on an AMD/ATI graphics card.
Use DirectInput FPS Fix.
See Sound problems (cracking, delays, missing music/effects, etc.)
Enter your computer's BIOS and turn off the hyperthreading CPU feature or turn off all but four cores. The specific procedure depends on your motherboard, thus you have to consult the manual of your motherboard if you're unsure how to do this.