React on Rails Pro: Introducing React Server Components & SSR Streaming

Subject: 🚀 Revolutionary Performance Boost: React Server Components & SSR Streaming Now Available in React on Rails Pro

June 24, 2025

We're thrilled to announce a major update: React on Rails Pro now supports React Server Components and Server‑Side Rendering (SSR) Streaming. These features have driven significant performance gains in real‑world applications—here’s how they can transform yours.

🎯 What This Means for Your Applications

• Faster load times
• Smaller JavaScript bundles
• Better Core Web Vitals
• Improved SEO
• Smoother user interactions

🔥 React Server Components

Server Components execute on the server and stream HTML to the client—no server-side JavaScript in your bundle. Real‑world results include:

• productonboarding.com experiment:
  • 62% reduction in client‑side bundle size
  • 63% improvement in Google Speed Index
  • Total blocking time: from 110 ms to 1 ms
• geekyants.com Case Study:
  • 52% smaller JavaScript and TypeScript codebase
  • Lighthouse scores improved from ~50 to ~90
• Airbnb’s RSC migration results:
• 15% improvement in core web vitals
• 23% reduction in Time to First Byte
• Meta’s developer portal migration:
  • 30% reduction in JavaScript bundle size
  • 60% improvement in Time to Interactive
  • 45% faster First Contentful Paint
  • 50% reduction in server response time
  • 25% decrease in overall maintenance complexity

Please note that only the first of these directly compares performance of equivalent applications with and without React Server Components. Other migrations may include React or other dependency upgrades and so on.

🌊 SSR Streaming

SSR Streaming sends HTML to the browser in chunks as it’s generated, enabling progressive rendering:

• An experiment at Nordnet comparing equivalent applications with and without streaming SSR:
  • 32% faster time to first byte
  • 40% faster total blocking time
  • Negative result: 2% increase in server load
• Hulu case study:
  • 30% faster page load times
• styled‑components v3.1.0: A massive performance boost and streaming server-side rendering support

Adopting these features in React on Rails Pro will help you deliver faster, leaner, and more SEO‑friendly applications with fewer client‑side resources.

Ready to get started?

1. Check out the docs for RSC with React on Rails Pro.
2. Update to the latest React on Rails Pro version
3. Follow our RSC & SSR Streaming migration guide

Let’s make your apps faster—together.