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Partial Hydration: The End of Slow Websites

· 16 min. o'qish
Evan Carter
Evan Carter
Senior frontend

TLDR:

Islands Architecture Hydration

Slow websites often aren’t slow because of HTML—they’re slow because too much JavaScript is shipped and executed just to “wake up” the UI. Partial hydration flips the model: render the page as fast, SEO-friendly HTML, then hydrate only the interactive islands. In this guide, we explain islands architecture (including Astro Islands), compare it to full hydration, and show how Feature-Sliced Design helps teams keep boundaries clear, bundles small, and large codebases maintainable.