Run results for: getElementById vs getElementsByClassName vs querySelector vs querySelectorAll - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36

Browser: Chrome 93

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
getElementById	4055543.0 Ops/sec
getElementsByClassName	3177767.0 Ops/sec
querySelector	2242514.0 Ops/sec
querySelectorAll	1076695.0 Ops/sec

Website performance monitoring

HTML Preparation code:

<div class="test" id="testing"></div>

Tests:

getElementById
document.getElementById("testing")
getElementsByClassName
document.getElementsByClassName(".test")
querySelector
document.querySelector(".test")
querySelectorAll
document.querySelectorAll(".test")