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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
I'm not 100% sure I'm afraid - you're on the right track with
targetlibs/stm32f4/lib/system_stm32f4xx.c- try settingHSE_VALUEtoo instm32f4xx.h(this could be done with aDEFINES+=in the Makefile).I guess if you looked at the serial port waveform with an Oscilloscope you might get an idea of how fast/slow it was running...