"Both aim to minimize JavaScript shipped to the browser while improving perceived performance and responsiveness. They reach those goals through fundamentally different design models, and the performance consequences are measurable rather than theoretical. The headline trade-off is simple: Islands can win on first-visit JavaScript cost, while Server Components can win over longer sessions by avoiding full-page reloads during navigation. Understanding Server Components Server Components execute entirely on the server and never ship their implementation code to the browser."
"When a Server Component renders, the server produces a serialized representation of the UI that is streamed to the client. This payload contains rendered output and references that indicate where Client Components should be hydrated. The model enforces a strict separation between two component types: Server Components handle data fetching, access backend resources directly, and render non-interactive content. Client Components manage interactivity, state, and browser APIs."
Islands Architecture and React Server Components both aim to reduce browser JavaScript while improving perceived performance and responsiveness. Islands Architecture minimizes first-visit JavaScript by shipping interactive islands only where needed, reducing initial bundle size. React Server Components execute on the server and never ship implementation code to the browser, streaming a serialized UI payload that indicates where Client Components should hydrate. Server Components handle data fetching and backend access, while Client Components manage interactivity and browser APIs. Islands often win on initial load cost, whereas Server Components can win during longer sessions by avoiding full-page reloads and reducing client-side work.
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