Run results for: jQuery 3.3.1 selector vs jQuery 2.1.4 vs document.querySelector vs document.getElementById

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.0.0; ONEPLUS A3010 Build/OPR1.170623.032) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.91 Mobile Safari/537.36

Browser: Chrome Mobile 68

Operating system: Android 8.0.0

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
jQuery 3.3.1	274205.6 Ops/sec
jQuery 2.1.4	278703.8 Ops/sec
Vanilla JS querySelector	621747.2 Ops/sec
Vanilla JS getElementById	1363620.0 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>
<script type="text/javascript">
  var jq331 = $.noConflict(true);
</script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.js'></script>
<script type="text/javascript">
  var jq214 = $.noConflict(true);
</script>
<div id="testElement"></div>

Tests:

jQuery 3.3.1
var el = jq331("#testElement")[0]; var className = el.className;
jQuery 2.1.4
var el = jq214("#testElement")[0]; var className = el.className;
Vanilla JS querySelector
var el = document.querySelector('#testElement'); var className = el.className;
Vanilla JS getElementById
var el = document.getElementById('testElement'); var className = el.className;

Run results for: jQuery 3.3.1 selector vs jQuery 2.1.4 vs document.querySelector vs document.getElementById

Comparing speed of jQuery 3.3.1 selector, jQuery 2.1.4, vanilla JS querySelector, and vanilla JS getElementById

jQuery 3.3.1

jQuery 2.1.4

Vanilla JS querySelector

Vanilla JS getElementById