Run results for: Selector performance - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36

Browser: Chrome 75

Operating system: Linux

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
getElementById	3023240.0 Ops/sec
querySelector	1792627.0 Ops/sec
getElementsByClassName	2974944.0 Ops/sec
querySelectorAll	882788.2 Ops/sec

Website performance monitoring

HTML Preparation code:

<div id='h'>Hello</div>
<div class='w'>World</div>
<div class='w'>!</div>

Tests:

getElementById
document.getElementById('h');
querySelector
document.querySelector('#h');
getElementsByClassName
document.getElementsByClassName('w');
querySelectorAll
document.querySelectorAll('.w');