A Content Delivery Network caches your assets at edge locations worldwide. Proper configuration involves: choosing the right cache-control headers, setting up origin shield, enabling gzip/brotli compression, configuring SSL/TLS at the edge, setting up custom error pages, and enabling HTTP/2 push. We compare Cloudflare, AWS CloudFront, and Fastly configuration approaches, and show you how to measure performance improvements using WebPageTest and Core Web Vitals.