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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
As @fanoush says - you get a hardware Serial1 which should work great at higher baud rates. You don't have to use software.
Also worth noting that you can move Serial1 between any pins, so potentially even if you need multiple Serial ports you may be able to get along with just the one bit of hardware, especially if there's RTS/CTS handshaking