A page that normally loaded in 180 ms took nearly four seconds during a small traffic spike—not because the VPS ran out of CPU, but because every request repeated the same database work. A short cache at the web server would have absorbed most of that load. This walkthrough covers a practical caching stack for a budget VPS, including what to cache, how to avoid leaking personalized pages, and how to check that the cache is actually working.

Start with the cheapest wins

Caching is not one switch. It’s a few layers, each useful for different kinds of content:

Browser caching reduces repeat downloads of static files.

Reverse-proxy caching lets Nginx serve eligible responses without calling your application.

Application or data caching avoids repeating expensive database queries or computations.

Start with the layer that matches the bottleneck. If a page is slow because it runs a costly query, caching the CSS won’t fix it.…