Adjust the speed you want, press Space to compare the block to the block I improved. Touch it with the mouse to see the wonderful difference in sensing, at the EXACT SAME SPEED! Green Flag will take it back to Custom Block sensing.
Just showing how "crawling" can work at the same speed as regular block- all through being without Screen Refresh! Not like it "replaces" the "move (10) steps" block completely- it wouldn't work without it. A more advanced example: http://beta.scratch.mit.edu/projects/10118645
