Just press the green flag. It will almost instantly render 4000 stamps. If you don't believe me, look in the scripts. UPDATE: Oops, before it only rendered 2000, but now it renders 4000. Thank you for your time! SECOND UPDATE: Whoops, typed in 2 instead of 20!
I made this. It is an example of how useful running without screen refresh is. This was a script for generating a 3D block building world, in case I ever make a 3D block building game, and as you can see (If you view this) It goes pretty darn quick for same costume stamp rendering, meaning that if you have a one costume stamp rendering 3D element in a game, use no screen refresh! I will clean up the crazy scripts before sharing :)