Slow Server Components Causing High Time to First Byte

1. Multiple sequential database queries instead of single query with joins
2. Fetching from external APIs synchronously during server component render
3. No caching or revalidation of frequently-fetched data
4. Heavy computation or transformation happening in server component
5. Waiting for dependent queries instead of parallel fetching

Parallelize fetches: Use Promise.all() to fetch data concurrently instead of sequentially:
const [users, posts] = await Promise.all([fetchUsers(), fetchPosts()])

Optimize queries: Use database joins instead of fetching related data separately. Check database query plans with EXPLAIN.

Cache data: Set appropriate revalidate times: revalidate: 3600 to cache for 1 hour.

Move to client: For non-critical UI, load data in client components after initial page render.