React의 새로운 서버 구성 요소는 홍수 된 웹 앱의 죽음 일 수 있습니다.

(*앞으로 뛰어들고 기술적 붕괴에 직접 뛰어들고 싶다면 React Server Components가 도입된 이유 1.

2010 년대 초반, React는 선언적 구성 요소 모델과 효율적인 가상 DOM diffing로 프론트 엔드 개발을 혁명시켰습니다. 간단한 뷰 라이브러리로 시작한 것은 곧 대규모 단일 페이지 애플리케이션 (SPA)의 척추가되었습니다.이 SPAs는 주로 Client-Side Rendering (CSR)를 사용하여 브라우저가 JavaScript 팩을 다운로드하고 실행하고 UI를 클라이언트에 전적으로 구축합니다.

이 클라이언트 중심의 모델은 유연하고 매우 상호 작용적이었으며 수년 동안 "현대적인"웹 앱을 정의했습니다.그러나 응용 프로그램이 더 복잡하고 기능이 풍부해지면서 CSR 접근 방식은 균열을 나타내기 시작했습니다.

• 더 긴 시간 인터랙티브 (TTI) : 무거운 자바스크립트 밴드와 클라이언트 측면 작업은 사용자가 실제로 페이지와 상호 작용하기 전에 더 오래 기다렸음을 의미했습니다.

• Hydration bottlenecks: Converting server-rendered HTML into an interactive app (hydration) became a performance choke point, especially as the amount of dynamic content increased.

• Bloated bundles: Applications often shipped far more JavaScript than necessary, burdening browsers with code for features or content that could have been delivered more efficiently.

• Performance that doesn’t scale: The larger and more complex the app, the harder it became to maintain snappy performance across all devices and network conditions.

  
  

Next.js는 서버 사이드 렌더링 (SSR), 정적 사이트 생성 (SSG) 및 기타 최적화 기능을 도입함으로써 이러한 고통의 일부를 해결하기 위해 등장했습니다.이 기술은 초기 로드 시간을 개선하고 UI 렌더링 작업의 일부를 서버로 렌더링했습니다.하지만 SSR 및 SSG에도 불구하고 근본적인 문제는 여전히 남아있었습니다 : 우리는 여전히 브라우저에 JavaScript를 과도하게 전달했습니다.

Fast forward to 2025. With Next.js 15 running on React 19, a new rendering paradigm has taken center stage: React Server Components (RSC)RSC는 개발자가 단일 React 나무로 서버에서 제공되는 구성 요소와 클라이언트에서 제공되는 구성 요소를 완벽하게 혼합할 수 있도록 해줍니다.The implications are significant.Static parts of the UI can now be delivered as pure HTML withzero JavaScript overhead. In other words, no client-side hydration is needed for those sections. Data fetching logic is also simplified by running inside server components, eliminating many unnecessary API calls from the browser. The result: leaner client-side bundles, faster interactions, and an application that’s far more performant and scalable.

This article isn’t a surface-level review of RSC. When I set out to write about using Next.js effectively in 2025, it quickly became clear that React Server Components deserved a dedicated deep dive. What follows is a technically rigorous exploration of how RSC works under the hood, how to leverage it in a Next.js 15 project, and why it represents a fundamental shift in frontend architecture.

By the end, I hope you come away with the same clarity and appreciation for RSC that I did through the process of researching and writing this piece.

Intro: From CSR to RSC — How Rendering Evolved in React

Intro: From CSR to RSC — How Rendering Evolved in React

지난 10년간 React 애플리케이션을 구축하는 방식은 근본적으로 진화했으며, 그로 인해 렌더링에 대해 생각하는 방식도 발전했습니다.

🕰 A brief history of Client-Side Rendering (CSR) in React

React는 그것을 통해 인기를 얻었습니다.Client-Side Rendering (CSR) — a model where the browser downloads JavaScript, executes it, and builds the entire UI on the client. This approach gave developers full control over interactivity and state, and made it easy to build dynamic single-page applications (SPAs).

However, CSR came with notable trade-offs:

• 느린 초기 로드, 특히 모바일 또는 가난한 네트워크
• Poor SEO for content-driven pages
• JavaScript-heavy bundles — even for pages with minimal interactivity
• A hydration step was required after HTML loaded, delaying time-to-interactive

잠시 동안, 이러한 제한은 단지 "일이 어떻게 됐는지."그리고 Next.js는 게임을 변경했습니다.

🚀 How Next.js brought SSR and SSG to mainstream React development

언제Next.js entered the scene, it introduced server-side rendering (SSR) and static site generation (SSG) as first-class citizens for React. This marked a turning point: frontend developers could now choose how and when rendering occurred.

• SSR enabled pages to be generated per request, improving SEO and load speed for dynamic content.
• SSG allowed content to be prebuilt at deploy time, perfect for blogs, docs, and marketing sites.
• Incremental Static Regeneration (ISR)는 정적 페이지가 배포 후에 업데이트 될 수 있도록 허용함으로써 이 격차를 제거했습니다.

This flexibility helped developers strike a better balance between performance, SEO, and developer experience.

그러나 SSR와 SSG에도 불구하고 여전히 한 가지 문제가 남아있었습니다.we were still sending too much JavaScript to the browser — even for components that didn’t need to be interactive.

🧠 The rise of React Server Components (RSC) in 2025

그들의 석방과 함께Next.js 15그리고React 19, we’ve entered a new era: React Server Components (RSC) are now a core part of how we build apps.

Unlike SSR, which still requires hydration and ships JavaScript to the client, RSC allows you to render components on the server — without sending any JavaScript to the browser at all.

It’s a big shift:

• Components can now access server-side data directly
• Static content doesn’t require hydration
• You can mix server and client components in a single React tree, composing your rendering strategy per component

RSC doesn’t replace SSR or SSG, it complements them, unlocking finer-grained control over performance, bundle size, and rendering behavior.

2025년, RSC는 모든 고위 React 엔지니어가 마스터해야 할 기본 개념입니다.

1. Why React Server Components Were Introduced

1. Why React Server Components Were Introduced

As React applications became more complex, the industry began to feel the weight of its success. While Client-Side Rendering (CSR), Server-Side Rendering (SSR), and Static Site Generation (SSG) offered different strategies for building performant web apps, each of them carried trade-offs that grew more apparent at scale.

CSR, SSR 및 SSG의 제한

1. Hydration overhead

Even with SSR or SSG, once HTML reaches the browser, React needs to “hydrate” the page — attach event listeners, reinitialize components, and effectively rebuild the app in memory. For large component trees, hydration can be a major bottleneck for Time-To-Interactive (TTI).

2. JavaScript bundle bloat

With CSR, every component, utility, and API call that’s part of the page must be sent to the browser — regardless of whether it’s interactive or not. SSR and SSG reduce this slightly, but most of the bundle still needs to be executed on the client. As apps grow, this leads to bloated bundles that slow down the user experience.

3개Disconnected data-fetching logic

Pre-RSC 세계에서 데이터는 그것을 렌더링 한 구성 요소 밖에서 살았습니다.getServerSideProps or getStaticProps (or call APIs in useEffect) to fetch data, then pass it into components via props. This separation added cognitive overhead and made code harder to co-locate and reuse.

🧠 What problems RSC was designed to solve

React Server Components (RSC) were created to address these growing pain points with a simple but powerful idea: let components execute on the server by default, and only send JavaScript to the browser when it’s absolutely necessary.

✅ Eliminate unnecessary JavaScript

RSC allows components to be rendered server-side without shipping any of their logic to the client. If a component doesn’t require interactivity, there’s no need to hydrate or load its JS bundle at all.

✅ Server-side data access within the component tree

RSC removes the artificial boundary between data fetching and rendering. Server components can use async/await데이터베이스, 파일 시스템 또는 API에 직접 액세스할 수 있습니다.co-locating data and view logic naturally, with no need for API routes or prop drilling.

✅ Improve rendering efficiency and developer experience

비 인터랙티브 논리를 서버로 이동함으로써 개발자는 더 작고 더 나은 성능을 갖춘 더 가벼운 앱을 만들 수 있습니다.RSC는 또한 정신 모델을 단순화합니다.You just write components, and let the framework handle where they run and how they ship.

RSC doesn’t aim to replace SSR or SSG, instead, it complements them. It lets you think at the component level, not just the page level, about what should run on the server and what belongs in the browser.

In short: React Server Components were designed to bring modern frontend development back to its lean, fast, and maintainable roots without compromising interactivity.

2. Rendering Strategies in Next.js 15: RSC vs SSR vs CSR

2. Rendering Strategies in Next.js 15: RSC vs SSR vs CSR

Next.js 15 offers developers a granular rendering model that goes far beyond traditional page-level strategies. With React Server Components (RSC) becoming a first-class concept, it’s essential to understand how they compare to two familiar models: Server-Side Rendering (SSR)그리고Client-Side Rendering (CSR).

While SSG (Static Site Generation) is still valuable in specific cases, it can be viewed as a caching strategy built on top of SSR. In contrast, RSC vs SSR vs CSR개별적인 런타임 렌더링 경로를 나타내고, 그들을 이해하는 것은 2025년에 성능 및 건축에 대한 의식적인 결정을 내리는 데 중요합니다.

💡 Before We Compare: What Do We Mean by "Interactive Component"?

In the context of React and Next.js, an interactive component is any UI element that requires client-side JavaScript to respond to user input or browser events.

This includes (but is not limited to):

• Buttons that update state on click

• Validation 또는 Controlled Inputs를 가진 양식

• Dropdowns and modals that toggle open/closed

• Animations triggered by scrolling or hover

• Tabs, carousels, filters, sliders

• Components that use useState, useEffect, or useReducer

  
  

If a component has event handlers, internal state, or relies on the DOM or browser APIs, it must run on the client.

Interactivity = Browser-side behavior + JS event listeners + local state.

Understanding this distinction helps clarify why RSC exists: to avoid shipping JavaScript for UI pieces that don’t need to be interactive.

Models at a Glance에 대한 리뷰 보기

Feature	RSC (React Server Components)	SSR (Server-Side Rendering)	CSR (Client-Side Rendering)
Render location	서버	Server	Client
JavaScript sent to browser	❌ None	✅ Yes	✅ Yes
Requires hydration	❌ No	✅ Yes	✅ Yes
Interactivity	❌ No	✅ Full	✅ Full
Access to server resources	✅ Direct	✅ Via getServerSideProps	❌ Needs API calls
When it runs	On-demand or streamed	Per request	On load in browser
Ideal use case	Static or data-bound views	Personalized or dynamic UI	Interactive flows, local UX

Feature

RSC (React Server Components)

SSR (Server Side Rendering)

CSR (Client-Side Rendering)

위치 Server Server Client

JavaScript sent to browser

❌ None

예

예

Requires hydration

❌ No

예

예

Interactivity

아니

✅ Full

전체

Access to server resources

✅ Direct

✅ Via getServerSideProps

❌ Needs API calls

When it runs

On-demand or streamed

Per request

On load in browser

Ideal use case

Static or data-bound views

Personalized or dynamic UI

인터랙티브 스트림, 로컬 UX

Feature

RSC (React Server Components)

SSR (Server Side Rendering)

CSR (Client-Side Rendering)

Feature

Feature

RSC (React Server Components)

RSC (React Server Components)

SSR (Server Side Rendering)

SSR (Server Side Rendering)

CSR(Customer-Side Rendering)에 대한 정보

CSR (Client-Side Rendering)

Render location

서버

Server

고객

Render location

Render location

Server

Server

서버

Server

고객

고객

JavaScript sent to browser

❌ None

예

예

JavaScript sent to browser

JavaScript sent to browser

❌ None

❌ None

✅ Yes

예

✅ Yes

예

Requires hydration

❌ No

예

예

수분이 필요하다

수분이 필요하다

아니

❌ No

예

예

예

예

인터랙티브아니

전체

전체

인터랙티브

인터랙티브

아니

아니

전체

전체

전체

전체

서버 리소스에 대한 액세스

직접

✅GetServerSideProps를 통해

API 호출이 필요합니다.

서버 리소스에 대한 액세스

서버 리소스에 대한 액세스

✅ Direct

✅ Direct

✅GetServerSideProps를 통해

✅GetServerSideProps를 통해

❌ Needs API calls

❌ Needs API calls

그것이 달릴 때

On-demand or streamed

요청에 따라

On load in browser

그것이 달릴 때

When it runs

On Demand 또는 Streamed

On-demand or streamed

요청에 따라

요청에 따라

브라우저에서 다운로드

On load in browser

Ideal use case

Static 또는 Data-Bunded 보기

개인화된 또는 역동적인 UI인터랙티브 스트림, 로컬 UX

Ideal use case

Ideal use case

Static or data-bound views

Static 또는 Data-Bunded 보기

Personalized or dynamic UI

개인화된 또는 역동적인 UI

인터랙티브 스트림, 로컬 UX

인터랙티브 스트림, 로컬 UX

Think in Components, Not Just Pages

In earlier versions of Next.js, rendering strategies were applied at the page level. You had getServerSideProps, getStaticProps, and whatever you chose applied to the entire page. This made sense in a world where rendering happened all-or-nothing — either statically at build time, or dynamically on each request.

But with React Server Components (RSC)그리고 Theapp/ directory introduced in Next.js 13+ and standardized in 15, rendering is no longer a top-down, one-size-fits-all decision. It becomes a per-component concern that unlocks a new mindset.

A New Way of Thinking: Declarative and Composable Rendering에 대한 리뷰 보기

This shift is more than an API change, it's a conceptual shift in how you architect your frontend.

Declarative

오케스트라 대신how and where부품은 수동으로 렌더링되며, 이제는 단순히declare what each component does and what it needsReact와 Next.js는 나머지를 처리합니다.

API 엔드포인트를 수동으로 연결하거나 SSR에서 구성 요소로 프로프를 전달하지 않습니다.You can just write:

// Server Component
export default async function ProductInfo() {
  const product = await db.getProduct(slug)
  return <div>{product.name}</div>
}

This component:

• Runs on the server
• 고객에게 JS를 보내지 않습니다.
• Doesn’t require any getServerSideProps or API layer
• 그것은 "단지 구성 요소"입니다 - 추가적인 추상화가 필요하지 않습니다

UI 및 데이터 요구 사항을 설명합니다.You describe the UI and its data needsdeclaratively그리고 렌더링 엔진은 나머지를 계산합니다.

Composable

Different parts of your UI can use different rendering strategies — on the same page,at the same time그리고with minimal overhead.

For example:

// Product page layout
<ProductInfo />           // Server Component (no JS, rendered on the server)
<AddToCartButton />       // Client Component (interactive)
<SimilarProducts />       // Static Component (SSG with revalidation)

These components live together in the same tree, but each one:

• Runs in a different environment (server, client, build)
• 필요한 데이터와 코드를 사용합니다.
• 브라우저에 필요한 것을 정확히 배송합니다 - 더 이상, 덜하지 않습니다.

더 구체적으로 말하자면, 나는 A를 만들었다.minimal demo that showcases how different rendering strategies can coexist on a single page.

3. How React Server Components Work Under the Hood

React Server 구성 요소가 모드 아래에서 작동하는 방법 (How React Server Components Work Under the Hood)

React Server Components(RSC)는 단순히 새로운 렌더링 전략이 아니라 구성요소 나무가 어떻게 구축되고, 렌더링되고, 전송되는지를 근본적으로 변화시킵니다.how it works behind the scenes그리고 그것이 상태, 상호 작용 및 데이터의 경계에 어떤 영향을 미치는지.

서버/클라이언트 경계: 분할 반응 나무

React applications using RSC are no longer fully rendered on the client. Instead, the component tree is split into two worlds: :

• Server Components: Execute only on the server. No JavaScript is ever sent to the browser. Cannot hold local state or attach event listeners. Perfect for rendering static content and server-bound logic (e.g., DB access).
• Client Components: Must be explicitly marked with "use client". These are compiled into browser-friendly JavaScript and support full interactivity, local state, useEffect, and event handling.

At build or runtime, React constructs a tree where server and client components coexist and stitches them together during render.

---

📍 What "use client"실제로는

당신이 추가할 때"use client" to a file, it marks that entire module and its exports as client-only. Behind the scenes, this instructs the Next.js build pipeline to:

• Compile that file (and its dependencies) into a separate JavaScript bundle
• Exclude that component from being run on the server
• 수분 논리를 가진 고전적인 React CSR 구성 요소처럼 취급하십시오.

This directive acts as a boundary marker between the two sides of the tree. All components above it can be server-rendered; all components below it must be rendered in the browser.

💧 Streaming: Rendering in Pieces, Not All at Once

RSC embraces streaming as a native rendering strategy. Instead of waiting for the full React tree to be built before sending it to the browser, the server streams serialized fragments of UI to the client as they become ready.

• Server Components are rendered and sent as soon as possible

• Placeholders (e.g. via <Suspense>) fill in temporarily

• Client Components hydrate incrementally, only when they load

  
  

이게 어떻게 가능할까요?

RSC introduces a concept called selective hydration. When a Client Component is rendered within a Server Component tree, React inserts a placeholder (<div data-rsc-placeholder />) and defers hydration.

Once the client has loaded the corresponding JS bundle:

1. React lazily loads that specific component
2. 자리를 찾고 살아있는 나무에 묶는다.
3. Hydrates it in isolation, without re-rendering the entire page

This design is decoupled and progressive: your app starts fast, and interactivity comes online gradually.

<Suspense fallback={<LoadingDetails />}>
  <ProductDetails />  // Server Component
</Suspense>

<AddToCartButton />    // Client Component (hydrated later)

⚙️ Data Fetching and Code Splitting in RSC

RSC의 또 다른 핵심 “마법” :you can fetch data directly inside components withasync/await — without relying on getServerSideProps, useEffect, or manual prop-passing.

// Server Component
export default async function Dashboard() {
  const stats = await getStatsForUser()
  return <StatsView data={stats} />
}

Why is this possible?

• RSC components run as real server functions, not as client-compiled modules
• They can access databases, internal APIs, file systems, or anything your server runtime supports
• The result is rendered HTML (not JS) and streamed to the client

Also:

• 정적 결과가 있기 때문에 수분이 필요하지 않습니다.
• No loading UI logic in the component itself — everything resolves before it hits the browser
• No code for this component is sent to the client — unless nested inside a client boundary

이로 인해 보일러 플레이트와 팩 크기가 크게 줄어들며, UI와 함께 논리를 유지할 수 있습니다.React의 오랜 목표는 마침내 규모에서 실현되었습니다.

State, Hooks, and Lifecycle Considerations 부근의 호텔

RSC does not support전통적인 React HooksuseState, useEffect또는useRef, because they don’t run in the browser.

Feature	Server Component	Client Component
useState		✅
useEffect		✅
useContext	✅ (if static)
ASYNC / 기다리기	✅	❌ (should wrap in effects)
Event handlers	❌

특징

Server Component

고객 구성 요소

useState

useEffect

ASYNC / 기다리기

(효과에 포장되어야 함)

이벤트

특징

Server Component

Client Component

특징

Feature

Server Component

Server Component

고객 구성 요소

Client Component

useState

✅

useState

useState

❌

✅

useEffect

useEffect

useEffect

✅

useContext

(만약 안정적인 경우)

사용문제

useContext

✅ (if static)

✅ (if static)

ASYNC / 기다리기

(효과에 포장되어야 함)

ASYNC / 기다리기

async/await

✅

(효과에 포장되어야 함)

(효과에 포장되어야 함)

이벤트

Event handlers

Event handlers

❌

❌

✅

This enforces a clean separation of responsibilities:

• Server Components: data and layout
• 클라이언트 구성 요소 : 상호 작용 및 로컬 상태

---

React Server Components는 앱을 단순화하도록 설계되었습니다.Once you internalize the boundary rules, the streaming model, and async data access, you cancompose fast, personalized, and minimal-JS apps with far less boilerplate than before.

4. What’s the Best Practice? Combining RSC, SSR, and SSG

4. What’s the Best Practice? Combining RSC, SSR, and SSG

One of the most common questions React engineers face in Next.js 15 isn’t “should I use RSC?” — it’s “how do I combine RSC with SSR and SSG in a maintainable, high-performance way?”

The beauty of Next.js 15 is that you’re no longer limited to one rendering strategy per page. Instead, you can now compose rendering strategies at the component level, applying the most appropriate approach to each part of the UI.

This section introduces a practical framework for making that decision based on actual architectural needs.

🧭 Start with the Core Question: What does this component need?

Ask these four questions for every component:

1. Does it need to be interactive?
   • ✅ Yes → Use a Client Component
2. Does it need secure, request-specific, or real-time data?
   • ✅ Yes → Consider SSR
3. Can it be precomputed or infrequently updated?
   • ✅ Yes → Prefer SSG
4. Does it fetch server data but never need to run on the client?
   • ✅ Yes → Use RSC

🧩 Example: Product Page Strategy Breakdown

다음은 전형적인 전자 상거래 제품 페이지가 세 가지 전략을 모두 사용하여 구성되는 방법입니다.

AddToCartButton CSR 인터랙티브 및 로컬 상태가 필요

부품	Rendering Strategy	Reason
ProductDetails	RSC	DB에서 얻은, 상호 작용 없음, 수분을 필요로하지 않음
PriceWithPersonalization	SSR	사용자 세션에 따라, 요청에 따라 동적
RelatedProducts	SSG (ISR와 함께)	건설 시간에 캐시할 수 있으며, 24시간마다 또는 태그 당 재확인할 수 있습니다.
상품명 Banner	RSC + 스트리밍	자주 변경, TTFB를 차단하지 않기 위해 Suspense로 스트리밍

부품

Rendering Strategy

Reason

ProductDetails

RSC

DB에서 얻은, 상호 작용 없음, 수분을 필요로하지 않음

PriceWithPersonalization

SSR

사용자 세션에 따라, 요청에 따라 동적

AddToCartButton CSR 인터랙티브 및 로컬 상태가 필요

RelatedProducts

SSG (ISR와 함께)

건설 시간에 캐시할 수 있으며, 24시간마다 또는 태그 당 재확인할 수 있습니다.상품명 Banner

RSC + 스트리밍

자주 변경, TTFB를 차단하지 않기 위해 Suspense로 스트리밍부품

Rendering Strategy

Reason

Component

Component

Rendering Strategy

Rendering Strategy

Reason

Reason

ProductDetails

RSC

DB에서 얻은, 상호 작용 없음, 수분을 필요로하지 않음

ProductDetails

ProductDetails

RSC

RSC

DB에서 얻은, 상호 작용 없음, 수분을 필요로하지 않음

Fetched from DB, no interactivity, no need to hydrate

PriceWithPersonalization

SSR

사용자 세션에 따라, 요청에 따라 동적

PriceWithPersonalization

PriceWithPersonalization

SSR

SSR

사용자 세션에 따라, 요청에 따라 동적

사용자 세션에 따라, 요청에 따라 동적

AddToCartButton CSR 인터랙티브 및 로컬 상태가 필요

AddToCartButton

AddToCartButton

CSR

CSR

Requires interactivity and local state

Requires interactivity and local state

RelatedProducts

SSG (ISR와 함께)건설 시간에 캐시할 수 있으며, 24시간마다 또는 태그 당 재확인할 수 있습니다.

RelatedProducts

RelatedProducts

SSG (ISR와 함께)

SSG (with ISR)

Safe to cache at build-time, can revalidate every 24h or per tag

건설 시간에 캐시할 수 있으며, 24시간마다 또는 태그 당 재확인할 수 있습니다.

상품명 Banner

RSC + 스트리밍

자주 변경, TTFB를 차단하지 않기 위해 Suspense로 스트리밍상품명 Banner

StockStatusBanner

RSC + 스트리밍

RSC + streaming

Frequently changing, streamed in with Suspense to not block TTFB

Frequently changing, streamed in with Suspense to not block TTFB

Each component is doing just what it needs to do- 더 이상, 더 적지 않다: 전체 페이지 흡수, 글로벌 데이터 캡처, 불필요한 JavaScript가 없습니다.

📐 Design Best Practices for Combining Strategies

✅ 1. Start Server-First

Design every component as a Server Component by default. Opt into interactivity ("use client"이것은 팩을 작게 유지하고 테스트를 단순화합니다.This keeps bundles smaller and simplifies testing.

제2장 국경을 명확하게 유지하라

Use folder naming or filename suffixes to make boundaries explicit:

/components
  /server/ProductDetails.tsx
  /client/AddToCartButton.tsx
  /shared/ReviewStars.tsx

✅ 3. Embrace Suspense for progressive delivery

Use <Suspense> to stream in non-critical RSCs without blocking the whole page:

<Suspense fallback={<LoadingReviews />}>
  <ReviewList />
</Suspense>

✅ 4. Co-locate logic with components

필요한 경우를 제외하고는 파일에 데이터 페팅 및 UI를 분할하지 마십시오.In RSC, you can colocateasync구성요소 나무 내부의 논리 - 프레임워크는 나머지를 처리합니다.

✅ 5. Use ISR (Incremental Static Regeneration) smartly

For cacheable, high-traffic pages like blog articles or marketing sections, use SSG + revalidation:

export const revalidate = 3600  // regenerate every hour

⚠️ Common Mistakes to Avoid

• ❌ Using "use client" by default — you’ll end up with CSR all over again
• 클라이언트 구성 요소에 데이터를 복구하면 서버에서 복구될 수 있습니다.
• 프로프를 통해 RSC와 클라이언트 구성 요소 간에 너무 많은 데이터를 전달하는 것 - 대신 클라이언트 구성 요소가 집중되고, 고립되고, 상태를 유지하도록하십시오.
• ❌ Recreating SSR-style getServerSideProps logic inside RSC — no need, RSC is server-side

나무의 결정을 정리하기

Here’s a simplified guide:

Is it interactive?
│
├── Yes → Client Component (CSR)
│
└── No
    │
    ├── Needs per-request data? → SSR
    │
    ├── Can be pre-rendered? → SSG
    │
    └── Otherwise → RSC

You don’t need to memorize it. Once you internalize how rendering maps to responsibility, the decisions become intuitive

최고의 관행은 "최고의 렌더링 전략"을 선택하는 것이 아닙니다.

It’s aboutdesigning rendering as an intentional part of your component architecture — with clarity, purpose, and performance in mind.

6. Looking Ahead: Why RSC Is More Than Just a Feature

6. Looking Ahead: Why RSC Is More Than Just a Feature

React Server Components are not just a performance optimization or a DX enhancement — they represent a foundational shift in how we build React applications. Much like React Hooks in 2019, RSC in 2025 is redefining the baseline for frontend architecture.

🧠 RSC Changes the Mental Model of Building in React

전통적인 React 개발은 항상 이 가정에 기초했다:

“The browser owns the runtime. We hydrate everything. Every piece of logic and data must live in the client, or be fetched via API.”

RSC breaks that assumption.

With RSC, you now ask:

• Can I skip hydration entirely?
• 이 구성 요소는 서버에서 순전히 실행할 수 있습니까?
• 내 UI에 백엔드 논리를 배치할 수 있습니까?

It gives us back the ability to separate display logic and interactivity cleanly그럼에도 불구하고, 포장 및 워크 라운드가 아니라,first-class architectural boundaries.

It’s no longer “client-first.” It’s “purpose-first.”

Each part of your UI exists where it’s most efficient — server, client, or static.

🌐 Ecosystem Shift Toward Server-First Rendering

RSC isn’t happening in isolation. The broader frontend ecosystem is undergoing a server-first rendering renaissance.

프레임 워크 같은 :

• Remix는 서버 데이터 로딩 및 양식 작업에 중점을 둡니다.
• Astro는 기본적으로 제로-JS를 채택하여 상호 작용의 섬만 배송합니다.
• Qwik은 수분을 극단적으로 가져옵니다 - 명시적으로 필요할 때까지 모든 JS를 연기합니다.
• Next.js 15은 RSC 및 App Router와 함께 이제 개발자 경험의 중심에 구성 요소별 렌더링을 넣습니다.

This isn’t a coincidence. It’s a reflection of a hard truth we’ve all felt:

Sending less JavaScript is the only way to scale interactivity and performance on the modern web.

React Server Components are the React-native answer to that challenge — deeply integrated, ergonomic, and production-ready.

🔮 What to Expect Next

The evolution is still ongoing. As React 19 and the ecosystem mature, we can expect:

• More granular debugging and profiling tools for RSC trees
• Better DevTools integration to show boundaries and hydration timelines
• Higher-order patterns to abstract rendering strategy (e.g., <ServerOnly>, <DeferredClient> wrappers)
• Broader adoption in design systems, frameworks, and libraries (e.g., RSC-aware UI kits)

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