React 19.2 and Partial Pre-rendering: The New Era of Web Rendering

Hello HaWkers, React just released version 19.2 with a feature that completely changes how we think about web application rendering. Partial Pre-rendering combines the best of both worlds: SSG speed with SSR dynamism.

Have you ever had to choose between a super fast static site or a slower dynamic application? That decision may be a thing of the past.

What is Partial Pre-rendering

Understanding the revolutionary concept.

The Problem It Solves

Before Partial Pre-rendering, developers faced a dilemma:

SSG (Static Site Generation):

Pages pre-rendered at build time
Ultra fast to serve
Static content, no personalization
Ideal for blogs, documentation

SSR (Server-Side Rendering):

Rendered on each request
Always updated content
Slower, more server resources
Ideal for dashboards, e-commerce

The problem: What if you need both on the same page?

How Partial Pre-rendering Works

React 19.2's new approach:

Main concept:

Pre-renders static parts at build
Serves static shell from CDN
Fills in dynamic parts later
Best of both worlds

In practice:

Page Part	Type	When It Renders
Header/Nav	Static	Build time
Footer	Static	Build time
Main content	Static	Build time
User data	Dynamic	Request time
Recommendations	Dynamic	Request time

Implementing Partial Pre-rendering

How to use it in practice.

Basic Configuration

The setup in Next.js 16:

// next.config.js
const nextConfig = {
  experimental: {
    ppr: true, // Enable Partial Pre-rendering
  },
};

export default nextConfig;

Marking Dynamic Components

Use Suspense to delimit dynamic areas:

// app/dashboard/page.jsx
import { Suspense } from 'react';
import StaticHeader from './StaticHeader';
import DynamicUserData from './DynamicUserData';
import StaticFooter from './StaticFooter';

export default function DashboardPage() {
  return (
    <div>
      {/* Static part - pre-rendered at build */}
      <StaticHeader />

      <main>
        <h1>Welcome to Dashboard</h1>

        {/* Dynamic part - rendered on request */}
        <Suspense fallback={<UserDataSkeleton />}>
          <DynamicUserData />
        </Suspense>

        {/* More static content */}
        <StaticSidebar />

        {/* Another dynamic area */}
        <Suspense fallback={<RecommendationsSkeleton />}>
          <PersonalizedRecommendations />
        </Suspense>
      </main>

      <StaticFooter />
    </div>
  );
}

Dynamic Component with Data

Fetching data on the server:

// components/DynamicUserData.jsx
async function DynamicUserData() {
  // This function runs on the server on each request
  const user = await fetchCurrentUser();
  const stats = await fetchUserStats(user.id);

  return (
    <div className="user-dashboard">
      <h2>Hello, {user.name}!</h2>

      <div className="stats-grid">
        <StatCard
          title="Active Projects"
          value={stats.activeProjects}
        />
        <StatCard
          title="Pending Tasks"
          value={stats.pendingTasks}
        />
        <StatCard
          title="Hours This Week"
          value={stats.hoursThisWeek}
        />
      </div>

      <RecentActivity activities={stats.recentActivity} />
    </div>
  );
}

export default DynamicUserData;

Performance Benefits

The gains are significant.

Comparative Metrics

Tests on a real application:

Before (Pure SSR):

Time to First Byte (TTFB): 800ms
First Contentful Paint (FCP): 1.2s
Largest Contentful Paint (LCP): 2.1s
Time to Interactive (TTI): 2.8s

After (Partial Pre-rendering):

Time to First Byte (TTFB): 50ms
First Contentful Paint (FCP): 200ms
Largest Contentful Paint (LCP): 600ms
Time to Interactive (TTI): 1.2s

Improvement:

TTFB: 16x faster
FCP: 6x faster
LCP: 3.5x faster
TTI: 2.3x faster

Why the Difference Is So Big

The secret is in the architecture:

Traditional SSR:

Request arrives at server
Server fetches ALL data
Server renders entire page
Sends complete HTML to client
Client sees the page

Partial Pre-rendering:

Request arrives at CDN
CDN serves static shell instantly
Client sees layout immediately
Server fetches dynamic data in parallel
Streaming fills in the gaps

// The static shell is already ready on CDN
// No computation needed to serve
const staticShell = `
  <html>
    <head>...</head>
    <body>
      <header>Logo | Nav</header>
      <main>
        <h1>Dashboard</h1>
        <!-- Placeholder for dynamic content -->
        <div id="user-data">Loading...</div>
      </main>
      <footer>...</footer>
    </body>
  </html>
`;

Ideal Use Cases

Where PPR shines.

E-commerce

Online stores benefit greatly:

// app/product/[id]/page.jsx
export default function ProductPage({ params }) {
  return (
    <div>
      {/* Static: Layout, nav, footer */}
      <Header />

      {/* Static: Product data (can be ISR) */}
      <ProductDetails productId={params.id} />

      {/* Dynamic: Personalized price */}
      <Suspense fallback={<PriceSkeleton />}>
        <PersonalizedPrice productId={params.id} />
      </Suspense>

      {/* Dynamic: Real-time availability */}
      <Suspense fallback={<StockSkeleton />}>
        <LiveStockStatus productId={params.id} />
      </Suspense>

      {/* Dynamic: User-based recommendations */}
      <Suspense fallback={<RecommendationsSkeleton />}>
        <PersonalizedRecommendations />
      </Suspense>

      <Footer />
    </div>
  );
}

Corporate Dashboards

Administrative panels:

Static parts:

Navigation sidebar
General layout
Titles and labels
Chart structures

Dynamic parts:

Real-time data
User metrics
Notifications
System status

News Portals

Content sites:

Static:

Main article
Page structure
Fixed ads

Dynamic:

User-recommended articles
Real-time view counter
Recent comments
Subscription status

Comparison with Other Approaches

How PPR positions itself.

PPR vs Islands Architecture

Two different approaches:

Aspect	PPR (React)	Islands (Astro)
Framework	React/Next.js	Astro
Hydration	Progressive	Partial
JavaScript	More JS sent	Less JS sent
Complexity	Lower curve	Higher curve
Ecosystem	Huge	Growing

PPR vs Streaming SSR

Natural evolution:

Streaming SSR:

Sends HTML in chunks
Still needs to render everything on server
Improves speed perception

Partial Pre-rendering:

Shell is already ready on CDN
Server only processes dynamic parts
Real speed improvement

To Migrate or Not to Migrate

Considerations for your project.

When to Migrate Now

Makes sense if:

Ideal scenarios:

Site with mix of static/dynamic content
Performance issues with SSR
Already using Next.js 14+
Team familiar with Server Components

Immediate benefits:

Server cost reduction
Core Web Vitals improvement
Better user experience
Enhanced SEO

When to Wait

Can wait if:

Scenarios:

100% dynamic application (internal dashboard)
100% static site (simple blog)
Different stack from Next.js
Small team, many priorities

Migration Checklist

Steps to adopt PPR:

Update Next.js to version 16+
Identify static vs dynamic parts
Refactor components with Suspense
Test performance before/after
Monitor metrics in production

The Future of Rendering

What comes after PPR.

Trends for 2026-2027

What to expect:

Expected evolutions:

PPR as default in React frameworks
Automatic component analysis tools
Automatic boundary optimization
Deeper integration with edge computing

Market impact:

Infrastructure cost reduction
Faster user experiences
Smaller gap between native and web apps
New UX possibilities

The arrival of Partial Pre-rendering in React 19.2 represents a significant shift in how we build web applications. No longer need to choose between speed and dynamism - we can have both.

If you are interested in how development tools are evolving, I recommend checking out another article: Vibe Coding: The Revolution in Software Development with AI where you will discover how AI is transforming how we code.

Let's go! 🦅

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