Caching can reduce repeated work and transfer delays. Its value depends on what is cached, for how long and how updates are released.
Separate public and personal content
Static images, fonts and versioned assets are common cache candidates. Personalised responses and account data need deliberate policies. Do not copy a long cache lifetime onto every response without understanding whether users could receive stale or inappropriate information.
Plan invalidation before release
Use versioned asset filenames where practical and define how HTML updates become visible. Test a corrected price or contact detail after deployment. A successful upload is not proof that every visitor receives the new response immediately.
Measure more than server distance
Compare cache hits, misses and repeat visits. A CDN does not remove heavy JavaScript, oversized images or slow third-party forms. Keep an origin recovery plan and verify important pages remain usable if an optional external service fails.