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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/114.0

Browser: Firefox 114

Operating system: Linux

Device Platform: Desktop

Date tested: 10 months ago

Test name	Executions per second
querySelector	5461410.0 Ops/sec
querySelectorAll	2339395.0 Ops/sec
getElementsByClassName	8535019.0 Ops/sec
querySelector (ID)	5260715.0 Ops/sec
getElementsByID	8925215.0 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")