jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.

jsperf.com URLs are mirrored at the same path, e.g:

https://jsperf.com/negative-modulo/2

Can be accessed at:

https://jsperf.app/negative-modulo/2

getElementById vs querySelector (v9)

Revision 9 of this benchmark created on July 14, 2023

Preparation HTML

<p class="foo">Foo</p>

Test runner

Ready to run.

Testing in
Test		Ops/sec
getElementById	`document.getElementsByClassName("foo");`	ready
querySelector("#foo")	`document.querySelector(".foo");`	ready
querySelector("[id=elem]");	`document.querySelector("[class=foo]");`	ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

Revision 1: published by Silver_Clash on February 23, 2013
Revision 3: published by Bigger dom on September 5, 2013
Revision 8: published on September 2, 2014
Revision 9: published on July 14, 2023