Info

DOM manipulation seems expensive.

This is to see how much processor usage can be saved by only touching the DOM when needed.

Preparation code

<div id="TargetDIV">Test DIV</div>
<script>
  Benchmark.prototype.setup = function() {
    var targetDIV = document.getElementById("TargetDIV");
    var posX =0, prevPosX=0;
  };
</script>

Preparation code output

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posX+=0.2;
var roundX = Math.round(posX);

if(posX>500)posX=0;
targetDIV.style.left=roundX+"px";

prevPosX = roundX;

posX+=0.2;
var roundX = Math.round(posX);
if(prevPosX!=roundX)
{
   if(posX>500)posX=0;
   targetDIV.style.left=roundX+"px";

   prevPosX = roundX;
}

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