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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
I'd say avoid writing an image that changes to flash - that could be really bad for the flash, and is going to be pretty slow. In terms of power usage, the screen uses about 10x more power than the CPU does when it's flat out, so I wouldn't worry about doing too much computation!
Also, you won't see any flicker if you overwrite the whole screen, as long as you do it with the same stuff :)