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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

appendChild in loop

699K/s

append

566K/s

replaceChildren

549K/s

View exact numbers

Test name	Executions per second
✓ appendChild in loop	699,320 Ops/sec
append	565,505 Ops/sec
replaceChildren	549,000 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)