Fast efficient way to move memory

[gfvalvo]

@PaulRB

but it will probably make very little difference overall because other parts of your sketch will be far slower, in particular the .show() which takes a fixed time for a given length of strip. The only way to speed up the animation may be to skip frames, in essence, by calling .show() a fixed number of times per second, resulting in some of the frames your code is drawing never actually being sent to the strip.

You could switch to a SPI-controlled LED strip type such as APA102 (aka Adafruit DotStar). I've clocked those at ~20MHz.