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:

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document.head vs getElementsByTagName (v3)

Revision 3 of this benchmark created on September 10, 2013

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
check	`document.head \|\| (document.head = document.getElementsByTagName('head')[0]);`	ready
assign	`document.head = document.head \|\| document.getElementsByTagName('head')[0];`	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