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DrAzzy
@Gordon
Yes, it seems pretty reliable without all the caps. I probably should have stuck more on, but there's very little available board space, and the 'main' capacitor isn't electrolytic, so has quite a low resistance anyway. I think the small size of the board really helps - it's not like there are long traces on VDD that make it susceptible to interference, or a big voltage drop from the regulator/main capacitor.
I'll be putting the next revision of the board through CE testing and have already pre-tested the existing board, which passed just fine - so the lack of extra capacitors isn't causing issues with radiation either :)
Having something with a bit more oomph might be nice in the future though - maybe ST will release a 168Mhz (or more) clock device in the UFQFPN48 pack at some point :)
... I still want to try doubling the Pico's clock though. I think it might be possible - especially if it were for small periods of time ;)
I think at the moment my priority for a 'new Espruino' - which could be a while off - is to put a radio on board. Having been using Espruino's for quite a lot of stuff in the house recently I'm getting thoroughly fed up with getting them connected. WiFi is still a bit of a pain - especially as my router keeps dropping out and will need replacing soon - and when that happens I'll be crawling around in the loft with a Laptop, changing my WiFi credentials on each board!