Speed
Image dimensions
Why it matters
Images without width and height attributes make the layout jump while the page loads, which hurts Cumulative Layout Shift.
How to fix it
- Add width and height attributes (or CSS aspect-ratio) to every image.
Check it with
- Core Web Vitals Checker – Check real-user LCP, INP and CLS from the Chrome UX Report for a page and its whole site.
Scoring: a passed check earns its full weight, a warning half and an error none. How the SEO score works