Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 26_2_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/144.0.7559.95 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 144

Operating system: iOS 26.2.0

Device Platform: Mobile

Date tested: 6 months ago

getElementById

70.7M/s

querySelector

13.7M/s

View exact numbers

Test name	Executions per second
✓ getElementById	70,710,368 Ops/sec
querySelector	13,678,634 Ops/sec

HTML Preparation code:

<div id="testElement"></div>

Tests:

getElementById
var el = document.getElementById('testElement'); var className = el.className;
querySelector
var el = document.querySelector('#testElement'); var className = el.className;