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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
Personally I'd say you probably want to put a logic analyser on it and compare with a board that does it properly.
The OneWire library itself should be pretty good now (i mean, it's worked fine on pretty much every architecture) and the only external things it uses are:
You found the first two, so if they work fine then about the only thing it could be is IRQs jumping in and causing problems.
Of course if it's like the ESP8266 then it actually 'caches' flash data in RAM and executes from that. If the OneWire + GPIO + delay code isn't in the correct section, it may end up having to be loaded on demand, which would mess up the timings.