At first glance, both approaches seem similar — they render HTML and send it to the browser. But under the hood, they behave very differently, and that difference can affect performance, SEO, scalability, and even your server costs.
If you're building with Next.js, one of the first real architectural decisions you’ll face is: Should this page be static or dynamic?
At first glance, both approaches seem similar — they render HTML and send it to the browser. But under the hood, they behave very differently, and that difference can affect performance, SEO, scalability, and even your server costs.
In this guide, we’ll break it down in a simple, practical way — no theory overload, just real understanding.
Static Rendering means your page is generated once at build time and then served as a ready-made HTML file. No server work happens when a user visits the page — it’s already done.
Think of it like cooking food in advance and storing it. When someone orders, you just serve it instantly.
export async function getStaticProps() {
const data = await fetch("https://api.example.com/posts").then(res => res.json());
return {
props: { data }
};
}
Dynamic Rendering means your page is generated every time a user requests it. The server runs code, fetches fresh data, and builds the page on the fly.
This is like cooking food only when someone orders — fresh, but slower.
export async function getServerSideProps() {
const data = await fetch("https://api.example.com/user").then(res => res.json());
return {
props: { data }
};
}
| Factor | Static (SSG) | Dynamic (SSR) |
|---|---|---|
| Speed | Extremely Fast | Slower |
| SEO | Excellent | Excellent |
| Data Freshness | Build-time | Real-time |
| Server Load | Low | High |
The real power of Next.js is that you don’t have to choose just one. You can mix static and dynamic rendering depending on the page.
For example:
👉 Blog pages → Static
👉 User dashboard → Dynamic
This hybrid approach gives you the best balance of performance and flexibility.
ISR is where things get really interesting. It allows static pages to update automatically after deployment — without rebuilding your entire app.
export async function getStaticProps() {
return {
props: {},
revalidate: 60
};
}
This means your page stays fast but still gets fresh data periodically.
Both static and dynamic rendering are SEO-friendly, but performance plays a big role.
In most cases, static rendering wins for SEO — but only if your content doesn’t need real-time updates.
No. It’s better for performance, but not for real-time data.
When data changes frequently or depends on the user.
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