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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
How many characters you receive at a time depends on lots of things, so I wouldn't worry about it - for instance if Espruino is busy running some code then you'll get lots of characters at once.
It might be related to the fact that ESP32 will have to send out the data it received out of a UART that is the same speed as the UART it receives data on.