Fastest way to clean out a node

JavaScript performance comparison

Revision 2 of this test case created by Joshua Koudys

Info

Comparing updating the innerHTML, cycling through the nodes, and cloning + dropping the node.

Preparation code

<div id="main">
  <div id="box"></div>
</div>
<script>
Benchmark.prototype.setup = function() {
    var box = document.getElementById('box');
    box.innerHTML = 'sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>s f</b>s df<p>df gsdfg sf g<b>';
};
</script>

Preparation code output

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
Clone + drop
debugger;
box.parentElement.appendChild(box.cloneNode(false));
debugger;
box.parentElement.removeChild(box);
pending…
Loop + drop children one by one
for (; box.lastChild; box.removeChild(box.lastChild));
pending…

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Revisions

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