Partial Hydration: The End of Slow Websites
· 16 min read
TLDR:

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.
