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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.
@JumJum
Some more timing info:
loop without calculating data takes 0.24 secs
loop returning a value only takes 0.14 secs
sending data to Display with spi.send(uintarray) needs 0,02 secs only