translate3d vs translate XY vs css left/top

JavaScript performance comparison

Revision 23 of this test case created by Justin

Preparation code

<div id="elem" style="position: absolute; background:#ccc; width:10px; height:10px;">
</div>
<script>
  var elem = document.getElementById("elem");
  var st = elem.style;
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
translate3d
var x = y = 0;
for (var i = 100, j = Math.random(); i--; j++) {
  x = j;
  y = j * 5;

  st.WebkitTransform = 'translate3d(' + x + 'px, ' + y + 'px, 0)';

}
pending…
translate3d (round)
var x = y = 0;
for (var i = 100, j = Math.random(); i--; j++) {
  x = j;
  y = j * 5;

  st.WebkitTransform = 'translate3d(' + (x|0) + 'px, ' + (y|0) + 'px, 0)';

}
pending…
translateX/Y
var x = y = 0;
for (var i = 100, j = Math.random(); i--; j++) {
  x = j;
  y = j * 5;

  st.WebkitTransform = 'translateX(' + x + 'px) translateY(' + y + 'px)';

}
pending…
translateX/Y (round)
var x = y = 0;
for (var i = 100, j = Math.random(); i--; j++) {
  x = j;
  y = j * 5;

  st.WebkitTransform = 'translateX(' + (x|0) + 'px) translateY(' + (y|0) + 'px)';

}
pending…
css left/top
var x = y = 0;
for (var i = 100, j = Math.random(); i--; j++) {
  x = j;
  y = j * 5;

  st.left = x + 'px';
  st.top = y + 'px';
}
pending…
css left/top (round)
var x = y = 0;
for (var i = 100, j = Math.random(); i--; j++) {
  x = j;
  y = j * 5;

  st.left = (x|0) + 'px';
  st.top = (y|0) + 'px';
}
pending…

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