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Server-side rendering (SSR) sends HTML generated by a server; client-side rendering (CSR) relies on JavaScript in the browser to build the page’s content. SSR can show useful content before the page’s JavaScript finishes, but it does not automatically make a page faster or interactive sooner. In many modern apps, the first response is server-rendered or static, while JavaScript later enables controls and client-side navigation.
What happens when a CSR page loads?
- The browser requests a URL and receives an HTML document, often with references to application JavaScript and other resources.
- The browser downloads, parses, and runs the JavaScript. If the main content is created by that code, it may not appear until this work is complete.
- The application may request data and use it to create or update elements in the page.
- After the app has loaded, navigating within it can update parts of the page without requesting a whole new document.
This shifts much of the rendering work to the browser. JavaScript downloads, execution, data requests, and DOM updates can postpone visible content or responsiveness, particularly on slower connections or less capable devices. Search crawlers may also have difficulty if they do not execute JavaScript, although that is a risk rather than a guarantee that a crawler will miss a CSR page. Next.js describes this CSR loading model and its potential trade-offs.
What happens when an SSR page loads?
- The browser requests a URL.
- For request-time SSR, the server generates HTML for that request and returns it. It can fetch current data while producing the response.
- The browser can display that HTML before all client-side JavaScript has run.
- If the page has client-side interactions, JavaScript hydrates the relevant parts so event handlers and other behavior work.
Next.js defines request-time server-side rendering as generating a page’s HTML on each request. That is different from generating HTML ahead of time at build time.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchReceiving visible HTML does not mean every control is ready. Next.js describes hydration as React’s process of attaching event handlers to the DOM “to make the static HTML interactive.” In its App Router explanation, the initial HTML is a fast, non-interactive preview; the browser then reconciles it with the React Server Component payload and hydrates Client Components. Read the App Router rendering explanation.
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How static generation differs from SSR
Static generation creates HTML before a visitor’s request, often during a build. Unlike request-time SSR, it does not need to generate that HTML anew for every visit. If content does not need to be personalized or refreshed on every request, static output can be served and cached through a CDN. web.dev explains the trade-offs among static rendering, SSR, and client rendering.
Prerendering can make an SPA’s content visible sooner, but it does not necessarily remove the need for client JavaScript to start the app and make it interactive. The key distinction is not simply whether HTML exists: it is when that HTML is produced, how fresh it must be, and how much browser-side work remains.
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Why modern apps often combine rendering approaches
SSR and CSR are not mutually exclusive choices for an entire site. A page can send server-generated or static HTML first, then use client JavaScript for interactive controls and later in-app navigation. Frameworks can also choose different strategies for different routes or components.
In the current Next.js App Router model, pages and layouts are Server Components by default. Client Components are used for features that need state, event handlers, lifecycle logic, or browser APIs such as window and localStorage. Server Components can fetch data near its source, keep secrets off the client, reduce the JavaScript sent to the browser, and stream content. Next.js documents how Server and Client Components work together.
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React Server Components can also send rendered server output as HTML, so the browser need not receive the original Server Component or libraries used only to render that content. React’s Server Components documentation explains this distinction.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to choose the right rendering approach
| Decision factor | Question to ask | What it points toward |
|---|---|---|
| First visible content | Does useful content arrive in the initial HTML, or only after JavaScript and data requests? | Server-rendered or static HTML can make content available before the client app finishes starting. |
| Interactivity | How much JavaScript must run before controls respond? | SSR can improve the early content milestone, but hydration still takes work. Keep client-side behavior focused on interactions that need it. |
| Data freshness | Must data be fetched for every request, can it be cached, or can it be generated at build time? | Request-time SSR fits data that must be current per request; static output can suit content that does not need that freshness. |
| Device and network constraints | How much JavaScript and DOM work must lower-powered devices perform? | Reducing client JavaScript can limit browser-side work; CSR-heavy pages may place more of that burden on the device. |
| Server and cache cost | Does per-request rendering justify its compute cost, and can the HTML be cached? | SSR uses server resources and may increase time to first byte. Static rendering can avoid repeated dynamic rendering and support CDN caching. |
| Personalization | Does the response depend on a user or frequently updated data? | Personalized or request-specific content may require dynamic work; cacheable, broadly shared content may suit static output. |
These are trade-offs, not a universal speed ranking. SSR may reduce the wait for CPU-bound JavaScript but increase time to first byte; static rendering can provide consistently fast time to first byte; CSR can increase JavaScript costs; and SSR followed by hydration can show content early while interaction still waits. web.dev’s rendering guidance discusses these performance considerations.
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What to remember about the loading sequence
- Visible content and working controls are separate milestones. HTML may appear before hydration makes client-side controls interactive.
- CSR moves rendering work into the browser. Downloading and running JavaScript, requesting data, and updating the DOM can delay content or responsiveness.
- SSR also has costs. Generating HTML for each request consumes server resources, and synchronous rendering can increase time to first byte.
- Static rendering suits content that need not be regenerated for each visitor. It can make CDN delivery and caching practical.
- A hybrid design is common. Use server-rendered or static output where it helps deliver content, and client components for interactions that require browser state or APIs.
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