Games have several graphics settings that you can tweak to get better performance. Most games don't have the exact same menu settings, but several graphics options appear time and time again. Knowing how these game settings affect performance is crucial to helping you set a game to its proper level. Crank the settings too high, and your frame rates will plummet into the single digits. Go too low, and you might end up sacrificing too much image quality for nominal performance gains.
Read more at GameSpot
Read more at GameSpot