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

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:107.0) Gecko/20100101 Firefox/107.0

Browser: Firefox 107

Operating system: Ubuntu

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
querySelector	2865018.0 Ops/sec
querySelectorAll	1413744.0 Ops/sec
getElementsByClassName	6568026.0 Ops/sec
querySelector (ID)	3248620.0 Ops/sec
getElementsByID	6591484.0 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")