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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)

<select id="fragment"></select>
<select id="concat"></select>

Setup JS

const fragparent = document.querySelector('#fragment');
const concatparent = document.querySelector('#concat');

Teardown JS

Test cases

Test #1

Title *

Async

Code *

const frag = new DocumentFragment();
for (var i=0; i<10000; i++) {
	const elem = document.createElement('option');
	elem.value = i;
	elem.textContent = i;
	frag.appendChild(elem);
};
fragparent.append(frag);

Test #2

Title *

Async

Code *

let str = '';
for (var i = 0; i < 10000; i++) {
	str += `<option value="${i}">${i}</option>`;
};
concatparent.append(str);