WS2812B neopixel strip extremely slow

With 144 LEDs it could be a bit slow - are there particular effects you're having trouble with?

There's a Uint24Array now which is pretty nifty - you can set a whole LED at once with it, which should speed things up quite a lot...

var arr = new Uint24Array(25*3);

function getPattern() {
  pos++;
  for (var i=0;i<arr.length;i++)
    arr[i]=E.HSBtoRGB((i+pos)*0.01,1,1);
}

function onTimer() {
  getPattern();
  require("neopixel").write(B15, arr.buffer);
}

setInterval(onTimer, 50);