EP 1 · 24 June 2026
Astro 5 Server Islands: static where it counts, dynamic where it matters
Astro 5 quietly shipped one of the best ideas in front-end this year: server islands. You keep the whole page static and CDN-cached, then punch out the one bit that needs to be live — cart count, auth state, prices — and stream it in after.
We rebuild a real page with it, look at what it does to Core Web Vitals, and find the one footgun nobody warns you about. Spoiler: it's the fallback.
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