Speed
Image optimisation
Why it matters
Modern formats such as WebP and AVIF are much smaller than JPEG or PNG at the same quality, so pages load faster.
How to fix it
- Serve WebP or AVIF versions of large images.
- Resize images to the size they are displayed at.
Check it with
- Page Speed Test – Lighthouse performance score, lab metrics and real-user Core Web Vitals for any page.
Scoring: a passed check earns its full weight, a warning half and an error none. How the SEO score works