TL;DR If a route in your Next.js App Router feels like full SSR—long TTFB, janky client navigations—try a conservative route-level "use cache" plus a small Suspense shell to let Partial Prerendering (PPR) do the heavy lifting. In practice this often drops TTFB from ~700ms to ~60–80ms and makes navigations feel instant. Why this matters Next.js's App Router and Cache Components model favor explicit caching. By marking expensive server work as cacheable and placing Suspense b...