Migrating a large React Single-Page Application (SPA) or Next.js Pages Router codebase to the Next.js App Router and React 19 Server Components unlocks massive improvements in Largest Contentful Paint (LCP), Interaction to Next Paint (INP), JavaScript bundle size, and organic Google SEO rankings.

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About the Author — Hire Freelance Programmer Aldian Fazrihady

Aldian Fazrihady is a Top-Rated Senior Freelance Programmer, Freelance Full Stack Developer, and AI Application Engineer with 15+ years of production software engineering experience and Google Cloud Professional Cloud Architect & Data Engineer certifications. He specializes in building custom LLM & autonomous AI agents, RAG pipelines, Next.js/React PWAs, Python (Django/FastAPI), Go microservices, and serverless cloud infrastructure on Google Cloud Run and AWS.

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