Run results for: jQuery 3.3.1 selector vs document.querySelector

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	291885.1 Ops/sec
Vanilla JS	708656.9 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>
<div id="testElement"></div>

Tests:

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

Run results for: jQuery 3.3.1 selector vs document.querySelector

Comparing speed of jQuery 3.3.1 selector and vanilla JS querySelector

jQuery 3.3.1

Vanilla JS