Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; LM-G820) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.134 Mobile Safari/537.36 OPR/70.3.3653.66287

Browser: Opera Mobile 70

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
getElementById	1932598.0 Ops/sec
querySelector	971289.4 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;