SEO & Core Web Vitals
Image Optimization for Core Web Vitals
Optimize images for Core Web Vitals improvement. Learn how LCP, CLS, and INP are affected by image delivery and how to improve all three.
How Images Affect Core Web Vitals
Google's Core Web Vitals measure real user experience through three key metrics. Images directly impact all three:
Largest Contentful Paint (LCP)
Measures loading performance. The LCP element is usually a hero image or banner. Large, unoptimized images directly increase LCP time.
Fix: Compress LCP images under 100KB, use AVIF/WebP, preload hints. Cumulative Layout Shift (CLS)
Measures visual stability. Images without width/height attributes cause layout shifts as they load, pushing content down.
Fix: Always declare width/height attributes, use aspect-ratio CSS. Interaction to Next Paint (INP)
Measures interactivity. Large images block the main thread during decoding, delaying responses to user interactions.
Fix: Use modern formats with faster decoding (AVIF, WebP), lazy load.| Metric | Image Impact | Optimization |
|---|---|---|
| LCP | Hero image load time | Compress, AVIF/WebP, preload |
| CLS | Missing dimensions | Width/height, aspect-ratio |
| INP | Decode blocking | Smaller files, lazy load |
SEO Case Studies & Guides
3
Core Web Vitals
Images
Primary Impact
Fixable
With Local Compression
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