Run results for: innerHTML vs insertAdjacentHTML vs appendChild vs insertAdjacentElement

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/123.0.6312.52 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 123

Operating system: iOS 17.3

Device Platform: Mobile

Date tested: 2 years ago

1) innerHTML +=

4.0M/s

2) insertAdjacentHTML

1.8M/s

3) appendChild

547K/s

4) insertAdjacentElement

446K/s

View exact numbers

Test name	Executions per second
✓ 1) innerHTML +=	4,010,658 Ops/sec
2) insertAdjacentHTML	1,770,333 Ops/sec
3) appendChild	546,561 Ops/sec
4) insertAdjacentElement	446,267 Ops/sec

Script Preparation code:

 box1 = document.createElement("div");

 box2 = document.createElement("div");
 box2HTML = box2.innerHTML;

Tests:

1) innerHTML +=
box1.innerHTML += box2HTML;
2) insertAdjacentHTML
box1.insertAdjacentHTML('beforeend', box2HTML);
3) appendChild
box1.appendChild(box2);
4) insertAdjacentElement
box1.insertAdjacentElement('beforeend', box2);