Quick Reference
Element Code: PE-016
Issue: Static resources have short or no cache lifetimes
Impact: Users re-download assets on every visit
Fix: Set long cache durations for static assets with cache busting
Detection: Lighthouse, HTTP header inspection
What Is This Issue?
Static assets like images, fonts, CSS, and JavaScript should be cached for long periods. This prevents repeat downloads and significantly speeds up return visits.
Why This Matters for Your Website
Proper caching can eliminate most asset downloads for returning visitors, dramatically improving load times and reducing server costs.
How to Fix This Issue
- Set Cache-Control: max-age=31536000 for static assets
- Use cache busting: Add version/hash to filenames
- Configure CDN: CDN caching for geographic distribution
Tools for Detection
- Lighthouse: Reports short cache durations
- DevTools Network: Shows cache headers
TL;DR (The Simple Version)
Your static files have short or no cache times. Set long cache durations (1 year) for images, fonts, CSS, and JS, and use versioned filenames for updates.
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