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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.
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Thanks - it's more a matter of looking at the external crystals themselves though (rather than the chip). I know only too well how rubbish the internal low-speed oscillator on the STM32F4 is :)
Some chips allow you to calibrate the internal RC oscillators, but it seems the STM32 doesn't. The best I can do is to change the divisor (which is usually 32768), but even that seems hard to do on the fly. I do have a branch with some code in, but I can't get it working reliably.
If 32kHz crystals aren't actually much more accurate than the 8Mhz ones, then it's not such a big deal switching over to use the 8Mhz crystal on the Pico.