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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.
user69728
Success! I've got it running the full 225 pixels at 25fps!
I kept tweaking the code and optimising as must as I could with no real change even at 115200. Then I change Serial1 to USB and boom full board working at full fps.
Changing to USB doesn't make it easy to work with but now I have a plug-n-play matrix output stick.