CDN and Edge Caching Strategy for a Multi-Region Audience

Putting Cloudflare or a similar CDN in front of an application is a five-minute infrastructure change that solves nothing on its own if every response still comes back with `Cache-Control: no-store`. The actual performance win requires deciding, route by route, what's safe to cache and for how long.

• Static assets — long cache with a hashed filename, so cache invalidation is just a new URL, never a purge.
• Public, non-personalized pages — cache at the edge with a short TTL and stale-while-revalidate for instant repeat visits.
• Personalized or authenticated responses — never cache at a shared edge layer; cache user-specific data client-side or in a private cache instead.
• Purge selectively by tag or path on content updates, not a blanket full-cache purge that spikes origin load.

For a genuinely global audience, the edge cache is what makes the difference between a page that loads in under 100ms worldwide and one that's fast in the origin region and sluggish everywhere else — but only if the caching rules are actually configured, not assumed.

A CDN with no caching strategy behind it is just a longer network path to the same slow origin response.