Run results for: innerHTML vs insertAdjacentHTML vs appendChild vs insertAdjacentElement

Run details:

User agent: Mozilla/5.0 (Linux; Android 9; SM-N950F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.101 Mobile Safari/537.36 OPR/60.0.3004.55063

Browser: Opera Mobile 60

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

1) innerHTML +=

411K/s

3) appendChild

306K/s

4) insertAdjacentElement

281K/s

2) insertAdjacentHTML

98K/s

View exact numbers

Test name	Executions per second
✓ 1) innerHTML +=	411,129 Ops/sec
3) appendChild	306,188 Ops/sec
4) insertAdjacentElement	281,011 Ops/sec
2) insertAdjacentHTML	98,111 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);