Run results for: querySelector vs. getElementById Performance

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:144.0) Gecko/20100101 Firefox/144.0

Browser: Firefox 144

Operating system: Windows

Device Platform: Desktop

Date tested: 9 months ago

getElementById

2.5M/s

querySelector

1.9M/s

View exact numbers

Test name	Executions per second
✓ getElementById	2,494,130 Ops/sec
querySelector	1,852,489 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;