jQuery vs. document.querySelector

JavaScript performance comparison

Revision 55 of this test case created by Lewis Cowles

Info

I know its been done before. Just want to see for myself with a newer version of chrome

Preparation code

<div id="main">
  <ul class="gallery">
    <li>
      Hello World
    </li>
    <li>
      Hello World
    </li>
    <li>
      Hello World
    </li>
    <li>
      Hello World
    </li>
    <li>
      Hello World
    </li>
    <li>
      Hello World
    </li>
  </ul>
</div>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
 
<script>
Benchmark.prototype.teardown = function() {
    var el = document.querySelector("#main ul:first-child");
    el.style.display = "list-item";
};
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
jQuery
$("#main ul:first-child");
pending…
DOM
var el = document.querySelector("#main ul:first-child");
pending…

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Revisions

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1 comment

Lewis Cowles (revision owner) commented :

wow jQuery even when doing nothing is over 96% slower... ouch

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