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:120.0) Gecko/20100101 Firefox/120.0

Browser: Firefox 120

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 5 months ago

Test name	Executions per second
querySelector	3580464.0 Ops/sec
querySelectorAll	1600150.0 Ops/sec
getElementsByClassName	7700540.0 Ops/sec
querySelector (ID)	3588974.0 Ops/sec
getElementsByID	7684121.0 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")