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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; rv:129.0) Gecko/20100101 Firefox/129.0

Browser: Firefox 129

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

appendChild in loop

649K/s

append

510K/s

replaceChildren

495K/s

View exact numbers

Test name	Executions per second
✓ appendChild in loop	649,114 Ops/sec
append	509,777 Ops/sec
replaceChildren	494,995 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)