The original title is "React Server Components: Under the Hood of Streaming and Client Boundaries"

Short summary

React Server Components (RSC) let you run components on the server while streaming serialized UI instructions to the client, improving perceived performance without losing interactivity. The server streams chunks incrementally using a custom encoding that marks client boundaries with placeholder IDs, allowing the client runtime to fetch and hydrate only the necessary client code. Proper use of the 'use client' directive is critical — missing boundary markers result in blank UI spots where the client never fetches the required bundle.

• •RSC streams serialized component trees incrementally rather than waiting for the full render
• •Client boundaries are marked with placeholder IDs so the client fetches only needed JS bundles
• •Missing 'use client' directives cause blank UI spots — boundaries are essential to the hydration handshake

Generated with AI, which can make mistakes.