How does Rails handle high-scale caching architecture with CDN and edge caching?

Rails integrates CDN and edge caching to reduce latency and offload origin servers.

At scale, Rails uses CDNs like CloudFront or Fastly to cache static assets and even dynamic HTML. Edge caching reduces origin hits and improves global performance. Combined with fragment caching and cache keys, Rails can serve precomputed responses. Cache invalidation becomes a major architectural concern.