P2 · MediumPerformance

No responsive images

Images missing srcset for responsive delivery

Code: no_responsive_images

Why it matters

Images missing srcset for responsive delivery. Slow experiences increase bounce rates and hurt Core Web Vitals scores. Google uses these metrics as a direct ranking signal.

How to fix

Add srcset for responsive images

html

<img
  src="image-800.jpg"
  srcset="image-400.jpg 400w, image-800.jpg 800w, image-1200.jpg 1200w"
  sizes="(max-width: 600px) 400px, (max-width: 1000px) 800px, 1200px"
  alt="Description"
  width="800"
  height="600"
>

Related checks in Performance

Slow First Contentful Paint

FCP exceeds 3 seconds

FCP needs improvement

FCP between 1.8-3 seconds

Slow Largest Contentful Paint

LCP exceeds 4 seconds

LCP needs improvement

LCP between 2.5-4 seconds

Poor Cumulative Layout Shift

CLS exceeds 0.25

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