Caching reduces application work by reusing a response that has already been produced. In a Rails application, that can lower server load and let more visitors reach common pages without every request running the full application stack.

Some caching strategies depend on separate services such as Memcached or Redis. Those are useful tools, but they can add operational cost and complexity to a small application that mostly renders the same public pages for every visitor.

Page caching takes a simpler approach: it creates an HTML snapshot of a page and lets the web server return that static result. Rails no longer includes page caching in its core framework, but the actionpack-page_caching gem makes the pattern available.

A local Apache Bench comparison illustrated the difference. Before caching, the test handled roughly 7.68 requests per second; after caching, it reached about 39.4 requests per second. Most requests completed substantially faster and fewer failed.

Cached pages need an invalidation plan when the underlying content changes. For a public blog, update events such as editing a post or accepting a comment are natural times to expire or rebuild the affected page.

This approach is strongest when visitors see the same content. It is not a good match for personalized dashboards or authenticated areas, where each user needs a distinct response. Used for public pages, though, it can deliver a substantial performance gain.