Next.js for engineers who have to ship and maintain it — RSC vs Client mental model, the four caching layers, streaming SSR, Core Web Vitals, and the App Router patterns that actually scale.
3 articles · updated regularly
Request memoization, the Data Cache, the Full Route Cache, and the Router Cache — what each layer stores, when it invalidates, and which one is serving you stale data right now.
Next.js has four overlapping caches. Most production bugs are misalignment between them — here's the map.
React Server Components changed the default. Picking RSC vs Client well is now the single biggest perf decision in a Next.js app.