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Make your pages faster on phones

Most slow pages have the same causes. Work through them in this order, because the first steps usually save the most.

Steps

A day or more

All guides

  1. LCP
  2. INP
  3. CLS
  1. Start with images: use a modern format, serve the right size, and load the ones below the fold later.
  2. Remove scripts the page doesn’t need, and load the others after the content.
  3. Reserve space for images and embeds so nothing jumps while the page loads.
  4. Scan again to see the test change. Real visitor data covers the last 28 days, so it moves more slowly.
Example
<img src="photo.webp" width="800" height="600" loading="lazy" alt="...">
<script src="widget.js" defer></script>
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