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SSR vs SSG vs ISR

Decision Matrix: SSR/SSG/ISR Selection Criteria

Criteria SSR (Server-Side Rendering) SSG (Static Site Generation) ISR (Incremental Static Regeneration)
Performance Fast initial load for dynamic content; server-side rendering delays first render. Instant load for static content; pre-rendered pages. Fast initial load with cached pages; revalidation delays first render for updated content.
Scalability High load on server; requires backend scaling. High scalability for static content; no server-side processing needed. Scalable with CDN caching; revalidation load depends on frequency.
SEO Good for dynamic content; search engines crawl rendered HTML. Excellent for static content; pre-rendered HTML improves SEO. Excellent for static content; cached pages are crawlable; revalidation ensures up-to-date content.
Real-Time Data Ideal for real-time updates; server-side data fetching. Limited; static content requires regeneration. Partial; revalidation updates content periodically; not suitable for real-time data.
Caching Efficiency No caching; server-side rendering requires server resources. Full caching; static files served from CDN. Hybrid caching; cached pages updated via revalidation; balances static and dynamic needs.
Development Complexity Higher; requires server-side setup and state management. Lower; static files and pre-rendered pages simplify deployment. Moderate; requires revalidation logic and caching strategy.
Code Example js<br>export async function getServerSideProps() {<br> const data = await fetchUserMetrics();<br> return { props: data };<br>} js<br>export async function getStaticProps({ params }) {<br> const post = await fetchPost(params.slug);<br> return { props: post };<br>} js<br>export async function getStaticProps({ params }) {<br> const products = await fetchProducts(params.category);<br> return { props: products, revalidate: 6,0 };<br>}

✅ Decision Guidance

  • Choose SSG for static content, SEO, and scalability.
  • Choose SSR for real-time data and dynamic user interactions.
  • Choose ISR for hybrid content with periodic updates and caching needs.
  • Prioritize performance and scalability by combining SSG with ISR for static assets.