Commands:

swap - description: swaps whether to restrict movement to x, y or z (!?) axes
fast_movement_checks - sets movement check rate to 20 times a second.
default_movement_checks - sets movement check rate to 5 times a second.
slow_movement_checks - sets movement check rate to 2 times a second.

note: default and fast should be pretty much the same feeling-wise (are for me) but maybe if your computer is slow it'll make a difference.