Run results for: querySelector vs. getElementById Performance

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:145.0) Gecko/20100101 Firefox/145.0

Browser: Firefox 145

Operating system: Windows

Device Platform: Desktop

Date tested: 8 months ago

getElementById

4.3M/s

querySelector

3.0M/s

View exact numbers

Test name	Executions per second
✓ getElementById	4,333,990 Ops/sec
querySelector	3,038,516 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;