Run results for: innerHTML vs insertAdjacentHTML vs appendChild vs insertAdjacentElement 2025

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

1) innerHTML

265K/s

2) insertAdjacentHTML

199K/s

View exact numbers

Test name	Executions per second
✓ 1) innerHTML	264,612 Ops/sec
2) insertAdjacentHTML	199,352 Ops/sec

HTML Preparation code:

<section>
  <div>
    <ul>
      <li>List item</li>
      <li>List item</li>
      <li>List item</li>
      <li>List item</li>
      <li>List item</li>
      <li>List item</li>
      <li>List item</li>
      <li>List item</li>
    </ul>
  </div>
</section>

Script Preparation code:

 let div = document.querySelector("div");

Tests:

1) innerHTML
div.innerHTML = 'Paragraph of textParagraph of textParagraph of textParagraph of textParagraph of text';
2) insertAdjacentHTML
div.replaceChildren(); div.insertAdjacentHTML('beforeend', 'Paragraph of textParagraph of textParagraph of textParagraph of textParagraph of text');