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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

Test case details

Title *

Description
(Markdown syntax is allowed)

Preparation Code

Preparation HTML
(this will be inserted in the <body> of a valid HTML5 document in standards mode)
(useful when testing DOM operations or including libraries)

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

var res = '',
    count = 10000;
while (count--) {
 res += '<div>';
 res += '<div>';
 res += '<div>';
 res += 'dddddddddddd';
 res += '</div>';
 res += '</div>';
 res += '</div>';
}
var c = document.createElement('div');
c.innerHTML = res;
document.body.appenChild(c);

Test #2

Title *

Async

Code *

var res = [],
    count = 10000;
while (count--) {
 res.push('<div>')
 res.push('<div>')
 res.push('<div>')
 res.push('dddddddddddd')
 res.push('</div>')
 res.push('</div>')
 res.push('</div>')
}
var c = document.createElement('div');
c.innerHTML = res.join('');
document.body.appenChild(c);