Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Linux; Android 7.1.2; Redmi 4X) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Mobile Safari/537.36 OPR/57.1.2830.52480

Browser: Opera Mobile 57

Operating system: Android 7.1.2

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
getElementById	338824.2 Ops/sec
querySelector	237297.8 Ops/sec

HTML Preparation code:

<div id="testElement"></div>

Tests:

getElementById
var el = document.getElementById('testElement'); var className = el.className;
querySelector
var el = document.querySelector('#testElement'); var className = el.className;