Hi Diaco!
Well, i couldn't get significant CPU improvement, but your snippet is still wonderful, it teached me how to get rid of callbacks with repeat: -1, and how to get rid of hardcoding the width, thank you very much for that! It reduced the usage of cpu approximately in a half. I doubt anything could be done more than that. I wonder how its hard for modern CPUs to do such a work. Maybe i should do GIF instead here...