Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Linux; Android 6.0.1; KIW-L21) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Mobile Safari/537.36

Browser: Chrome Mobile 94

Operating system: Android 6.0.1

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
getElementById	369372.5 Ops/sec
querySelector	201054.1 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;