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

Run details:

User agent: Mozilla/5.0 (Android 13; Mobile; rv:109.0) Gecko/119.0 Firefox/119.0

Browser: Firefox Mobile 119

Operating system: Android

Device Platform: Mobile

Date tested: 7 months ago

Test name	Executions per second
querySelector	534646.0 Ops/sec
querySelectorAll	243186.0 Ops/sec
getElementsByClassName	1031377.0 Ops/sec
querySelector (ID)	540992.7 Ops/sec
getElementsByID	1053103.0 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")