2.5 Images (Lever 5)LowInferred
Missing responsive srcset
Without srcset, every device downloads the same image, often far larger than a phone needs. Responsive images serve the right size per device.
What it is
No responsive image sources.
Why it matters
Serves wrong sizes; perf cost.
How to fix it
Add srcset/sizes.
How to find it on your site
- Check whether content images use srcset and sizes.
- Identify large images served at one fixed size.
- Add srcset with appropriately sized variants.
- Re-test load on mobile.
Cross-reference to ranking and citation factors
Responsive images cut bytes on small screens, helping mobile speed and LCP. The gain is largest on image-heavy pages.
Impact
Low. Inferred.
Evidence
Responsive images aid performance. web.dev, Core Web Vitals (Google); Google Search Central, Image SEO best practices
Sources