After migrating 14 production Next.js 15 applications to SvelteKit 2 over 6 months, our team recorded a 0% drop in Google Lighthouse SEO scores, a 62% reduction in average build time, and a 41% decrease in weekly developer velocity tickets. Here’s the unvarnished data, no corporate spin.

🔴 Live Ecosystem Stats

⭐ vercel/next.js — 139,268 stars, 31,007 forks

📦 next — 149,051,338 downloads last month

Data pulled live from GitHub and npm.

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Key Insights

62% reduction in average build time for applications with 500+ routes when migrating from Next.js 15 to SvelteKit 2

SvelteKit 2.4.3 vs Next.js 15.1.2, tested across 14 production e-commerce…