In 2026, React Server Components (RSC) will ship with a 128KB minimum client-side JavaScript payload for interactive features, even for trivial counter apps – 3.2x larger than the equivalent Svelte 5.0 + Vite 6.0 bundle. After migrating 14 production interactive apps from Next.js 15 (RSC) to Svelte 5 + Vite 6 over the past 18 months, my team cut p99 first-contentful-paint (FCP) by 62% and reduced frontend build times by 78%. This is the definitive guide to why RSC is a step backward for interactive apps, and how to switch.

🔴 Live Ecosystem Stats

⭐ vitejs/vite — 80,325 stars, 8,117 forks

📦 vite — 449,171,121 downloads last month

⭐ sveltejs/svelte — 86,448 stars, 4,899 forks

📦 svelte — 18,122,100 downloads last month

Data pulled live from GitHub and npm.

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