DIY Gamer Conversion

Thought I'd give the Matrix a try by porting over code from the gamer library here, which has been converted to:

var OE = B6;
var CLK1 = C6;
var CLK2 = C7;
var DAT = C8;
var LAT = C9;

var HIGH = 1;
var LOW = 0;

pinMode(OE,   'output');
pinMode(CLK1, 'output');
pinMode(CLK2, 'output');
pinMode(DAT,  'output');
pinMode(LAT,  'output');

var counter = 0;
var currentRow = 0;
var image = new Uint8Array(8);

var display = [
  [1,1,1,1,1,1,1,1], 
  [1,1,1,1,1,1,1,1], 
  [1,1,0,0,0,0,0,0], 
  [1,1,1,1,1,1,1,1], 
  [1,1,1,1,1,1,1,1], 
  [1,1,0,0,0,0,0,0], 
  [1,1,1,1,1,1,1,1], 
  [1,1,1,1,1,1,1,1] 
];


function updateDisplay()
{
  var newImg = new Uint8Array(8);
  for(var j=0; j<8; j++) {
    newImg[j] = 0x00;
    for(var i=0; i<8; i++) {
      newImg[j] <<= 1;
      newImg[j] |= display[j][i];
    }
  }
  if(newImg != image) {
    for(var i=0; i<8; i++){
      image[i] = newImg[i];
    }
  }
}

function updateRow()
{
	if(counter==8) {
		counter = 0;
		currentRow = 0x80;
	}
	writeToRegister(0);
	writeToDriver(image[counter]);
	writeToRegister(currentRow);
	currentRow >>= 1;
	counter++;
}

function writeToDriver(dataOut)
{
    //console.log("Driver data:" + dataOut);
	digitalWrite(OE, HIGH);

	for(var x=0; x<=7; x++) {
      digitalWrite(CLK1, LOW);
      digitalWrite(DAT, (dataOut & (1<<x)) >> x);
      digitalWrite(CLK1, HIGH);
    }

	digitalWrite(LAT, HIGH);
	digitalWrite(LAT, LOW);
	digitalWrite(OE, LOW);
}

function writeToRegister(dataOut)
{
    //console.log("Register data:" + dataOut);
	digitalWrite(LAT, LOW);

	for(var y=0; y<=7; y++) {
      digitalWrite(DAT, (dataOut & (1<<y)) >> y);
      digitalWrite(CLK2, HIGH);
      digitalWrite(CLK2, LOW);
	}
	digitalWrite(LAT, HIGH);
	digitalWrite(LAT, LOW);
}

updateDisplay();

setInterval(function(){
  updateRow();
}, 1);

And it actually works, to a degree :) Right now, because it's using a bitshifter to update the LED rows one at a time, it seems the Espruino isn't firing quick enough to make it look seemless.

http://t.co/B9q0BoKey2

Is there anything that can be done to speed this up? or can anyone suggest any alternative way of updating the display in one burst?

Many thanks

Matt