Run results for: querySelector vs. getElementById Performance

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:149.0) Gecko/20100101 Firefox/149.0

Browser: Firefox 149

Operating system: Windows

Device Platform: Desktop

Date tested: 4 months ago

getElementById

12.7M/s

querySelector

8.6M/s

View exact numbers

Test name	Executions per second
✓ getElementById	12,744,895 Ops/sec
querySelector	8,630,223 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;