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

document.head vs getElementsByTagName (v4)

Revision 4 of this benchmark created by r on December 5, 2014

Test runner

Ready to run.

Testing in
Test		Ops/sec
document.head	`var head = document.head;`	ready
getElementsByTagName	`var head = document.getElementsByTagName( 'head' )[ 0 ];`	ready
querySelector	`var head = document.querySelector( 'head' );`	ready

Revisions

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

Revision 1: published by Andreas Goebel on April 25, 2013
Revision 3: published on September 10, 2013
Revision 4: published by r on December 5, 2014
Revision 5: published by Konstantin Tarkus on November 20, 2015