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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
The speed is actually the final clock frequency after the PLL (in fact it may only be used for documentation). It's not smart enough to work out the clock settings - those are still hard-coded in the STM32 peripheral library.
And yes, I can do custom designs - I'm a bit busy with Puck.js at the moment, but early next year I should be able to do things for you.
I guess the other option if you're only after one or two is to replace the chip with an STM32F412. They're new chips from ST with 256kB of RAM, but they should be (I think) pin compatible with the Pico/Wifi board - and compiling for them should be as easy as changing settings in BOARD.py for the Pico.