Run results for: innerHTML vs insertAdjacentHTML vs appendChild vs insertAdjacentElement

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_7_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.6.4 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.7.5

Device Platform: Mobile

Date tested: 2 years ago

1) innerHTML +=

2.4M/s

3) appendChild

1.9M/s

4) insertAdjacentElement

1.7M/s

2) insertAdjacentHTML

1.0M/s

View exact numbers

Test name	Executions per second
✓ 1) innerHTML +=	2,350,689 Ops/sec
3) appendChild	1,870,415 Ops/sec
4) insertAdjacentElement	1,651,436 Ops/sec
2) insertAdjacentHTML	1,011,866 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);