Run results for: querySelector vs querySelectorAll vs getElementsByClassName vs querySelector (ID) vs getElementsByID - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/116.0

Browser: Firefox 116

Operating system: Linux

Device Platform: Desktop

Date tested: 8 months ago

Test name	Executions per second
querySelector	2605945.0 Ops/sec
querySelectorAll	1200424.0 Ops/sec
getElementsByClassName	4876085.0 Ops/sec
querySelector (ID)	2756205.0 Ops/sec
getElementsByID	4841777.0 Ops/sec

Website performance monitoring

HTML Preparation code:

<div class="test" id="test"></div>

Tests:

querySelector
document.querySelector(".test")
querySelectorAll
document.querySelectorAll(".test")
getElementsByClassName
document.getElementsByClassName(".test")
querySelector (ID)
document.querySelector("#test")
getElementsByID
document.getElementById("test")