At Raflay we build production web apps and often choose the right tool based on product needs. React and Next.js are related but serve different roles: React is a UI library; Next.js is a framework that uses React and provides routing, rendering modes, and server-side features. Below we expand on trade-offs, performance characteristics, real-world metrics, and an actionable migration plan.
Core differences — deep dive
React provides the building blocks for UI but does not prescribe routing, data fetching, or rendering mode. Next.js supplies conventions and tooling: file-system routing, optimized image delivery, and multiple data-fetching strategies (SSR/SSG/ISR/SSR-with-cache).
Rendering modes and concrete trade-offs
- SSG (Static Site Generation): Very fast for public content; best for blogs and marketing pages. Pros: CDN-friendly, low server cost. Cons: rebuilds required for content updates unless ISR used.
- ISR (Incremental Static Regeneration): Combines SSG speed with periodic updates. Good for catalogs and pages that update often but not every second.
- SSR (Server-Side Rendering): Best for dynamic content that requires per-request personalization or up-to-date data. Pros: fresh content and SEO. Cons: higher server costs and complexity.
- CSR (Client-Side Rendering): Use for dashboards or highly interactive apps where SEO isn't primary.
Performance metrics and expectations
From our projects, SSG pages with proper CDN caching typically show sub-200ms Time to First Byte (TTFB) when served from the edge. SSR pages vary more (200–600ms depending on data fetch complexity). Key optimizations Raflay enforces:
- Image optimization and lazy-loading
- Critical CSS and component-level code splitting
- Edge caching strategies for SSR responses
Migration pattern — practical steps
- Audit existing React app to identify SEO pages and client-only pages.
- Introduce Next.js and route a small subset of pages (marketing or SEO pages) to the new framework.
- Iterate: move components, adopt data fetching hooks, and add caching strategies.
When React-only wins
For micro-frontends, embeddable widgets, or internal admin consoles where SEO and initial load cost are less important, a React-only setup with Vite or CRA can be leaner.
Costs and developer velocity
Next.js reduces boilerplate and improves developer velocity on product teams. It creates consistent patterns which lowers maintenance costs over time. Raflay generally recommends Next.js for customer-facing web products unless there is a strong justification to remain React-only.
Checklist: pick Next.js if…
- Your product needs SEO or public content pages.
- You want faster developer onboarding with conventions like file-based routing.
- You intend to use modern hosting platforms with edge functions and serverless.
Need a custom evaluation?
Raflay offers architecture audits where we profile your current app and produce a migration plan including estimated effort and performance projection. Contact hello@raflay.comm.