SSR vs SSG vs ISR in Next.js: The Definitive SEO Comparison
When to choose Static Generation, Server Rendering, or Incremental Static Regeneration for optimal crawling and TTFB speed.
Rendering Strategy Shapes Search Indexing Speed
Next.js offers multiple rendering paradigms. Choosing the wrong rendering mode can lead to slow Time to First Byte (TTFB) or stale content served to search crawlers.
1. Static Site Generation (SSG)
- Best for: Landing pages, blog articles, terms, and about pages.
- Advantage: Instant edge CDN delivery with virtually 0ms server computation.
2. Incremental Static Regeneration (ISR)
- Best for: Large service catalogs, e-commerce catalogs, and programmatic pages.
- Advantage: Pages are generated statically on demand and refreshed in the background without full rebuilds.
3. Server-Side Rendering (Dynamic SSR)
- Best for: Client dashboards, real-time tracking portals, and user-personalized feeds.
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