Comment Fixed Refresh Rates (Score 4, Insightful) 230
A display (television or monitor) has a fixed refresh rate. Assuming vertical synchronization is turned on to avoid tearing, you're pretty much limited to a framerate which evenly divides into the true refresh rate of the display. If the refresh rate is 60 fps, possible targets include 60 frames per second (providing 16.7 ms of computation time per frame), 30 FPS (providing 33.3 ms of computation time per frame), 15 FPS (providing 66.7 ms of computation time per frame), and so on. Anything below 30 FPS is kind of a joke, so nobody reputable would consider allowing more than 33 ms computation per frame in a shipping game.