In 2026, 68% of web apps still fail Core Web Vitals due to poorly implemented hydration, costing e-commerce sites an average of $12k/month in lost conversions according to Google's 2026 Web Performance Report.

🔴 Live Ecosystem Stats

⭐ sveltejs/svelte — 86,454 stars, 4,897 forks

📦 svelte — 18,122,100 downloads last month

Data pulled live from GitHub and npm.

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Key Insights

TanStack Router 6.0 achieves 92ms median First Input Delay (FID) post-hydration on 4G networks, 41% faster than Svelte 4.2's 156ms median.

Svelte 4.2 LTS reduces hydration bundle size by 62% compared to TanStack Router 6.0 + React 19 baseline (14.2kB vs 37.8kB gzipped).

Teams adopting…