Run results for: Cached querySelector

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:127.0) Gecko/20100101 Firefox/127.0

Browser: Firefox 127

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

cached

516.8M/s

uncached

1.4M/s

View exact numbers

Test name	Executions per second
✓ cached	516,757,920 Ops/sec
uncached	1,398,888 Ops/sec

HTML Preparation code:

<div id="fir" class="hi">
  <div id='no' class="ss">
  	<div id='ff' class="fox">
      <button class="target"></button>
      <button class="target"></button>
      <button class="target"></button>
    </div>
  </div>
</div>

Script Preparation code:

var cache = {};

Tests:

uncached
var el = document.querySelectorAll('target');
cached
var el = cache['target']; if (!el) { el = document.querySelectorAll('target'); cache['target'] = el; }

Run results for: Cached querySelector

Testing if caching querySelector makes a diference

uncached

cached