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

Run details:

User agent: Mozilla/5.0 (Android 12; Mobile; rv:109.0) Gecko/109.0 Firefox/109.0

Browser: Firefox Mobile 109

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
querySelector	420007.2 Ops/sec
querySelectorAll	199437.3 Ops/sec
getElementsByClassName	1009335.0 Ops/sec
querySelector (ID)	399765.9 Ops/sec
getElementsByID	1019770.0 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")