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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
Ahh - I thought you were doing software PWM, rather than just updating at 500Hz (the Espruino and Espruino Pico can't do hardware PWM on their LEDs).
But yes, that's about what I'd expect. By turning on 'offline minify' in settings you could probably get quite a big jump in speed with that.