Caching Fundamentals

Summary

Storing the result of an expensive operation so future requests can reuse it instead of recomputing — one of the most effective and most misused performance techniques in backend systems.

• 1Identify one expensive operation in a project that's a good caching candidate.
• 2Measure response time with and without caching for the same endpoint.
• 3Learn the golden rule: cache invalidation is the hard part, not the caching itself.