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

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:90.0) Gecko/20100101 Firefox/90.0

Browser: Firefox 90

Operating system: Windows 7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
querySelector	2478805.0 Ops/sec
querySelectorAll	1019003.0 Ops/sec
getElementsByClassName	4333540.0 Ops/sec
querySelector (ID)	2477566.0 Ops/sec
getElementsByID	4502476.0 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")