Run results for: querySelector vs. getElementById Performance

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 137

Operating system: Android

Device Platform: Mobile

Date tested: 8 months ago

getElementById

13.1M/s

querySelector

3.3M/s

View exact numbers

Test name	Executions per second
✓ getElementById	13,107,112 Ops/sec
querySelector	3,278,272 Ops/sec

HTML Preparation code:

<div id="el"></div>

Tests:

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