Stepper Motor Issues

@Gordon @DrAzzy

This is the code I'm using to generate what is called a 'Wave Drive' using this module DC 5V Stepper Motor + ULN2003 Driver Test Module and this is the result I'm getting: video

Can someone tell me why this motor is spinning so slowly?

function stepper(func) {
  var a = C11, b = C9, c = C7, d = C6;
  var list = [d,c,b,a];
  for (var j = 0; j < 1000; j++) {
    for (var v = 0; v < list.length; v++) {
      digitalWrite(list[v],1);
      for (var h = 0; h < list.length; h++) {
        func(h,v,list);
      }
    }
    digitalWrite(d,0);
  }
  digitalWrite(a,0);
}

function stepperWaveDrive() {
  stepper(function (h,v,list) {
    if (list[h] != list[v]) digitalWrite(list[h],0);
  });
}

stepperWaveDrive();

//stepperNormalFull();

This is the attempt with Espruino 4 Step Control Code

Video

var step = 0;
var steps = [0b0001,0b0010,0b0100,0b1000];
var stepperPins = [C11,C9,C7,C6];

function doStep() {
 step++;
 digitalWrite(stepperPins, steps[step % steps.length]);
}
var stepInterval = setInterval(doStep, 200);