4 min read
Image Optimization for Blogs: WebP, AVIF, Lazy Loading, and CDNs
Images are the biggest performance bottleneck. Learn formats, compression, lazy loading, and CDN delivery for perfect scores.
R
ruben
Format Comparison
| Format | Size vs JPEG | Browser Support | Best For |
|---|---|---|---|
| JPEG | Baseline | Universal | Photos (fallback) |
| WebP | 25-35% smaller | 97%+ browsers | Most images (recommended) |
| AVIF | 50% smaller | ~85% browsers | Hero images, large photos |
Optimization Checklist
- Convert to WebP (with JPEG fallback)
- Set explicit width and height to prevent CLS
- Lazy load below-fold images with
loading="lazy" - Preload hero/LCP image
- Serve through CDN for edge caching
- Compress to 80% quality (visually lossless)