Run results for: querySelector vs. getElementById Performance

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0

Browser: Firefox 142

Operating system: Linux

Device Platform: Desktop

Date tested: 5 months ago

getElementById

3.4M/s

querySelector

2.1M/s

View exact numbers

Test name	Executions per second
✓ getElementById	3,410,118 Ops/sec
querySelector	2,100,736 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;