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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:141.0) Gecko/20100101 Firefox/141.0

Browser: Firefox 141

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

appendChild in loop

948/s

replaceChildren

383/s

append

374/s

View exact numbers

Test name	Executions per second
✓ appendChild in loop	948 Ops/sec
replaceChildren	383 Ops/sec
append	374 Ops/sec

HTML Preparation code:

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

Script Preparation code:

const root = document.getElementById('root');
const numChildren = 100;
const children = [];

for (let i = 0; i < numChildren; i++) {
	children[i] = document.createElement('span');
}

Tests:

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