what does limit frame rate do in minecraft?

Answer 1

It limits the number of frames in game, and it can make Minecraft less laggy on some systems.

Answer 2

It limits the ammount of frame rates You computer needs to produce "FPS" http://www.minecraftwiki.net/wiki/FPS

Answer 3

YOu can also turn it off in Options.

Answer 4

used mainly for computers that aren't very efficient at running games. makes the game run smoother.

Answer 5

The limit framerate option synces the maximum number of frames-per-second to that of your monitor's display rate (also in frames-per-second) by using V-Sync. V-Sync is explained more thoroughly here: http://en.wikipedia.org/wiki/Screen_tearing#V-sync