Run results for: querySelector vs. getElementById Performance

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_7_12 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 16

Operating system: iOS 16.7.12

Device Platform: Mobile

Date tested: 5 months ago

getElementById

24.8M/s

querySelector

7.5M/s

View exact numbers

Test name	Executions per second
✓ getElementById	24,828,940 Ops/sec
querySelector	7,503,329 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;

Run results for: querySelector vs. getElementById Performance

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getElementById

querySelector