jQuery cached selectors vs uncached

JavaScript performance comparison

Revision 61 of this test case created by Anas Nakawa

Info

Comparing the performance difference between cached jQuery 1.7 objects and non cached ones.

Preparation code

<style type="text/css">
  .bar { display: none; }
</style>
<h1>
  HTML Ipsum Presents
</h1>

<p>
  <strong>
    Pellentesque habitant morbi tristique
  </strong>
  senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam,
  feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam
  egestas semper.
  <em>
    Aenean ultricies mi vitae est.
  </em>
  Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra.
  Vestibulum erat wisi, condimentum sed,
  <code>
    commodo vitae
  </code>
  , ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros
  ipsum rutrum orci, sagittis tempus lacus enim ac dui.
  <a href="#">Donec non enim</a>
  in turpis pulvinar facilisis. Ut felis.
</p>

<h2>
  Header Level 2
</h2>
<ol>
  <li>
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
  </li>
  <li>
    Aliquam tincidunt mauris eu risus.
  </li>
</ol>
<blockquote id="foo" class="bar" name="baz">
  <p>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus magna. Cras in
    mi at felis aliquet congue. Ut a est eget ligula molestie gravida. Curabitur massa.
    Donec eleifend, libero at sagittis mollis, tellus est malesuada tellus, at luctus
    turpis elit sit amet quam. Vivamus pretium ornare est.
  </p>
</blockquote>
<h3>
  Header Level 3
</h3>
<ul>
  <li>
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
  </li>
  <li>
    Aliquam tincidunt mauris eu risus.
  </li>
</ul>
<pre>
  <code>
    #header h1 a { display: block; width: 300px; height: 80px; }
  </code>
</pre>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>

Preparation code output

HTML Ipsum Presents

Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, commodo vitae , ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis tempus lacus enim ac dui. Donec non enim in turpis pulvinar facilisis. Ut felis.

Header Level 2

  1. Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
  2. Aliquam tincidunt mauris eu risus.

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus magna. Cras in mi at felis aliquet congue. Ut a est eget ligula molestie gravida. Curabitur massa. Donec eleifend, libero at sagittis mollis, tellus est malesuada tellus, at luctus turpis elit sit amet quam. Vivamus pretium ornare est.

Header Level 3

  • Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
  • Aliquam tincidunt mauris eu risus.
  
    #header h1 a { display: block; width: 300px; height: 80px; }
  

Test runner

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Testing in unknown unknown
Test Ops/sec
ID non-cached
$("#foo").hide();
$("#foo").show();
pending…
ID cached
var $foo = $("#foo").hide();
$foo.show();
pending…
Class non-cached
$(".bar").hide();
$(".bar").show();
pending…
Class cached
var $bar = $(".bar").hide();
$bar.show();
pending…
Tag non-cached
$("blockquote").hide();
$("blockquote").show();
pending…
Tag cached
var $block = $("blockquote").hide();
$block.show();
pending…
Attribute non-cached
$("[name='baz']").hide();
$("[name='baz']").show();
pending…
Attribute cached
var $name = $("[name='baz']").hide();
$name.show();
pending…

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