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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
Thanks!
As far as the Pi goes, if you look at what gets loaded when it boots, it's an insane amount. It'd be well worth fiddling with building your own Linux kernel - it's very configurable and you can really strip it back.
To be honest I bet someone's already come up with a super-minimal distribution. You could try OpenWRT as a start. I bet you could get the boot time well under 1 second with fairly little work.