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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.
@fanoush
Not sure I understand the question but main difference is that Bangle is a product supported by full time job which is hopefully paid well enough from sales of the watch or other related activities. So you get what you pay for.
As for the "optimized' part I would call it polished, stable and more fail proof, not sure if having a bit more parts in JS affects speed that much. Even for Bangle a lot of 'system' code is in js.
https://github.com/espruino/Espruino/tree/master/libs/js/banglejs
https://github.com/espruino/BangleApps/tree/master/apps/boot
and other system apps