Run results for: querySelector vs. getElementById Performance

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36

Browser: Chrome 143

Operating system: Linux

Device Platform: Desktop

Date tested: 6 months ago

getElementById

14.7M/s

querySelector

4.8M/s

View exact numbers

Test name	Executions per second
✓ getElementById	14,700,881 Ops/sec
querySelector	4,819,450 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;