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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
Yes, just having the image vars at the top will help - it won't use much RAM but it does avoid having to search for the files on the flash memory first, so it's definitely an improvement.
Bangle.js isn't super fast though so I'm afraid you will likely always see some delay...