Fetching data in Next.js 13 has been vastly improved with Server Components, smarter caching, and Loading UI.

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Next.js 13 introduces improvements in data fetching, including server-side rendered (SSR) data, static-site generated (SSG) data, incremental statically-generated (ISR) data, and dynamic client-side data. With the new App Router in Next.js 13, data fetching is greatly simplified and provides a more responsive user experience with smarter caching and deduping.

Less code, better UX: Fetching data faster with the Next.js 13 App Router – Vercel

Vastly improved data fetching with App Router