Faster Array looping

Hello,
I've got an 8x16 LED matrix and I'm using the Graphics module to draw a simple game onto it. I'm using an Array to hold some background pixels with I then loop and use Graphics.setPixel() to output. Everything works fine but looping my array for active pixels seems very slow. So my question is, is there a fast/better way to be doing the following?

  // Create empty array
  var board = Array();
  for (var r=0; r < 16; r++) {
      board[r] = Array();
      for (var c=0; c < 8; c++) {
          board[r][c] = 0;
      }
  }

  // (un)set pixels in array code here

  // Loop and output pixels
  for(var r=0; r < 16; r++) {
      for(var c=0; c < 8; c++) {
          if(board[r][c] == 1) {
              martix.setPixel(c,r);
          }
      }
  }