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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.
@allObjects
@ga,
looking good. Very interesting approach to make a watch face more alive and injecting analog aspects into digital representation.
Regarding calculation intervals: you can actually have multiple events with different timeout times / interval times going, so that the minimum calculations are executed to save power and extend battery life. Same applies for applying changes to the display: update only what is actually required to be updated. Bangle.js2 is already very fast, much faster than Bangle.js. Display size and color depth and how the display driver is communicating with the processor. Using vector fonts is process intensive. May be you can use a bitmap copy process rather than a drawing process, since the number of character you need are very small, and the variation in size is limited (what's the min and max font size for hr and min?). Storage in Flash EEPROM rather than RAM should provide you enough space to do something like that.
Checkout out this conversation about setFontCustom bitmap format vs vertical_byte:true - GT24L24A2Y fontchip in F07 fitness tracker