Image optimization through your CDN is non-negotiable in 2026.

Image optimization through your CDN is non-negotiable in 2026.

Unoptimized images are still the #1 cause of slow affiliate sites. A product page with 15 uncompressed JPEGs loading from origin will never pass Core Web Vitals, regardless of how good your hosting is.

The right approach:

1. Upload source images (high-quality PNG or TIFF) once
2. Use your CDN's image transformation API to serve the right format automatically
3. Cloudflare Images, BunnyCDN Optimizer, Imgix — all do this

The CDN detects the browser's Accept header, serves WebP to Chrome/Firefox, AVIF to supported browsers, JPEG as fallback. No manual conversion, no plugin bloat.

Sizing matters too. Serving a 2000px wide image to a mobile user is wasteful. CDN image resizing lets you define breakpoints: mobile gets 480px, tablet gets 960px, desktop gets 1200px. One URL parameter handles it.

For niche affiliate sites with lots of product imagery, this alone can reduce page weight by 60-70%. That directly improves bounce rate and time-on-site — both of which correlate with affiliate conversions.