I think what Alain means is when you go from 0 to 255, it simply adds 1 to the present number. When it reaches 255 it doesn't do any resetting. It simply adds 1 to 255 and it goes back to 0 itself. On 0 to 150 it has to constantly monitor the number and reset to 0 after 150. This uses more memory. I just learned a lesson from your post myself.