Speed
Browser caching
Why it matters
Browser caching lets returning visitors reuse files instead of downloading them again.
How to fix it
- Send Cache-Control headers with long lifetimes for versioned static files (CSS, JS, images, fonts).
Check it with
- HTTP Headers Checker – View all HTTP response headers for a URL, with notes on the ones that matter for SEO.
Scoring: a passed check earns its full weight, a warning half and an error none. How the SEO score works