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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
When was the last time you rebooted? Worth a try...
Also, are you downloading/uploading anything over WiFi? Often Bluetooth LE and WiFi use the same aerials and so repetitive WiFi traffic seriously impacts Bluetooth LE performance.
I remember trying to give a talk while streaming my display over WiFi and it was a complete disaster. The second I moved to a cable everything worked faultlessly.