In a 2024 benchmark of 10,000 concurrent requests, Next.js 15’s edge-rendered routes added 42ms of hidden framework overhead versus SvelteKit’s 8ms—costs that compound at scale and can erase 60% of your CDN’s performance gains if unaddressed.

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Key Insights

Next.js 15’s App Router adds 18ms of server-side rendering overhead per request versus SvelteKit’s 4ms in identical workloads (benchmarked on AWS t3.medium, Node 22, 1000 requests)

Tested frameworks: Next.js 15.0.0-canary.12, SvelteKit 2.5.7,…