29 Common Next.js Mistakes That Kill Performance (Without You Noticing)
Are you making critical Next.js mistakes without realizing it? This tutorial covers 29 common mistakes developers make with server components, client components, server actions, cache components, suspense boundaries, and route handlers. Learn Next.js best practices for optimization, performance, static rendering, dynamic rendering, and proper use cache implementation. Whether you're working with the Next.js app router, React server components, or debugging Next.js errors, this comprehensive guide will help you avoid these pitfalls and write production-ready code following Next.js development best practices in 2026.
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⏰ Chapters
00:00 - Intro: Next.js Mistakes
01:06 - Mistake 1: Client Page Component
02:56 - Mistake 2: Unprotected Server Actions
06:07 - Mistake 3: Server Components in Actions File
08:16 - Mistake 4: Shipping AI Code Unreviewed
12:22 - Mistake 5: Route Handlers vs Server Components
14:32 - Mistake 6: Suspense Boundary Placement
15:55 - Mistake 7: Cache vs Cache Private
19:00 - Mistake 8: Update Tag vs Refresh
22:33 - Mistake 9: Context Providers
24:14 - Mistake 10: Browser APIs in Server Components
26:15 - Mistake 11: Unnecessary Client Components
27:30 - Mistake 12: Data Revalidation
29:39 - Mistake 13: Redirect in Try-Catch
31:08 - Mistake 14: Overusing Server Components
32:23 - Mistake 15: Not Using Loading.tsx
34:34 - Mistake 16: Fetching Data Twice
37:16 - Mistake 17: Hydration Errors
38:19 - Mistake 18: Layout.tsx Usage
41:04 - Mistake 19: Not Caching Repeatable Code
41:58 - Mistake 20: Environment Variable Leaks
44:30 - Mistake 21: Missing Error.tsx
45:25 - Mistake 22: Dynamic Metadata
46:03 - Mistake 23: Request Memoization
46:32 - Mistake 24: Redirect vs Router Push
48:36 - Mistake 25: Google Fonts Loading
49:40 - Mistake 26: Debug Logs
50:55 - Mistake 27: Image Sizes Prop
52:04 - Mistake 28: Cache Tagging
54:08 - Mistake 29: Mutations in Server Components
55:34 - Next Steps
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