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Hydration in Leptos involves rendering the initial HTML on the server and then, on the client via WebAssembly, attaching event listeners and state management to enable fast page loads, SEO benefits, and interactive features, with example SSR code illustrating the process.
This article traces a decade of front‑end rendering evolution, explaining traditional server‑side rendering, the rise of client‑side frameworks, modern hybrid approaches such as SSR, SSG, ISG, progressive and selective hydration, streaming SSR, islands architecture and React Server Components, while highlighting their trade‑offs and use‑cases.
The article explains the Resumable rendering concept introduced by Miško Hevery, contrasts it with traditional SSR hydration, details its implementation in the Qwik framework, compares it to React Server Components, and discusses why React has not adopted this approach despite its performance benefits.
This article explains the fundamentals of server‑side rendering versus client‑side rendering, highlights the performance drawbacks of traditional hydration, and introduces Qwik’s resumable approach that serialises state and events into HTML to achieve near‑zero hydration overhead while maintaining interactivity.
The article explains the origins and advantages of the Islands architecture, compares MPA and SPA approaches, details how frameworks like Astro and Fresh implement Islands, and shares practical insights and performance data from the author’s own Island.js project.