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:123.0) Gecko/20100101 Firefox/123.0

Browser: Firefox 123

Operating system: Linux

Device Platform: Desktop

Date tested: one month ago

Test name	Executions per second
querySelector	4713769.0 Ops/sec
querySelectorAll	2320035.0 Ops/sec
getElementsByClassName	8854509.0 Ops/sec
querySelector (ID)	4692025.0 Ops/sec
getElementsByID	8861140.0 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")