When we set out to build Zenith Walls , we made a promise: we were going to serve pristine, uncompromised 4K and 8K wallpapers — crisp enough for ultra-wide OLED monitors — while keeping the browsing experience buttery smooth on mobile and desktop alike. Then reality hit. We were dealing with a catalog of over 70,000 images sourced across multiple external CDNs and our own Cloudflare R2 object storage. If you've ever thrown hundreds of uncompressed 10MB–25MB images into a Next.js grid wit...