Run results for: Append children VS appendChild in loop VS replaceChildren

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:153.0) Gecko/20100101 Firefox/153.0

Browser: Firefox 153

Operating system: Linux

Device Platform: Desktop

Date tested: 5 days ago

appendChild in loop

5K/s

replaceChildren

3K/s

append

3K/s

View exact numbers

Test name	Executions per second
✓ appendChild in loop	5,265 Ops/sec
replaceChildren	2,835 Ops/sec
append	2,815 Ops/sec

HTML Preparation code:

<div id="root"></div>

Script Preparation code:

var root = document.getElementById('root');
var children = [
    document.createElement('span'),
    document.createElement('span'),
    document.createElement('span'),
    document.createElement('span'),
    document.createElement('span'),
];

Tests:

append
root.append(...children);
appendChild in loop
for (let i = 0; i < 5; i++) { root.appendChild(children[i]); }
replaceChildren
root.replaceChildren(...children)