Title says it all.

Turbo-mode is rapid-fire, but makes things hard to control.

Custom blocks with no screen refresh checked run quickly but really can't be used for actual gameplay, only for generating data.

The best ways are to use few forever loops and instead of having a loop run your process (repeat for (10) times), stack up that amount of blocks, because there is a slight delay between each run of the loop.

Hope this helps.

Is this fast enough? http://scratch.mit.edu/projects/14389773/#player

Thanks guys! I was using just hold down the space key. I'll try the new way soon! And scubajerry, yes, and that was even faster than I thought!