Architecture: Core processing of jsiLoop

Yeah, from the look of it, it might 'just work', but best to check. RAM usage is the only real consideration I can think of.

From an implementation point of view, does ESP8266 have a 'SYSTICK' counter (just a 32 bit counter that ticks up every clock cycle and overflows). Then Espruino could have some relatively speedy check of that such that it didn't yield so often it was painfully slow.