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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 using SPI send, you can probably get more performance by putting the data into a Uint8Array first.
... did you check the signal with an oscilloscope? Your problem could be electrical - WS2811s don't like running off 5v while being driven off a 3.3v signal. It works on Espruino boards because the 5v line comes off USB via a diode, so is actually nearer 4.5v.
In the docs on the site it's suggested that you put the pin into open drain mode and then pull it up to 5v with a resistor, but I'm not sure if the ESP8266 is 5v tolerant?