Keynote Feature: Infrastructure
summary
Vercel handles about 100 billion requests per week and only ~0.5% of function invocations are cold starts, but the platform targets those with three fixes: Rust-powered functions which cut cold starts by ~80 ms on average and up to 500 ms in large apps; bytecode-optimized functions that show up to 30% faster cold starts by shipping compiled bytecode instead of parsing node_modules at runtime; and partial pre-rendering (PPR) that streams static parts immediately while dynamic holes load. Next.js 15 adds React 19 support, improved caching defaults, per-route PPR, and Turbopack opt-in.
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