Frames Per Second
There is a reason why movies are at 24 fps ( DVD 25 fps mind you ) . the reason is very simple, and has been research by the first cartoonist, times where making a cartoon required drawing all 'images' by hand.
At 24 FPS, the human eye stop detecting the refresh of the whole frame, catching only the change in them. Thats is why, as soon as the movie reach 24 fps, it is 'smooth'. Try to push that limit will not work apart if the movie itself is 'Filmed/recorded' using higher frame rate VideoCameras. But you all know that, it is called 'The Bullet Time' as shown in 'The Matrix' movie. Simply a scene filmed with over 200 shots/per sec instead of the classic 24
Looking at a Quake III movie will play it only at the movie framerate