Vercel precompiles Python bytecode at build time, cutting cold starts from 2.8s to 1.3s
Vercel Blog·medium signal
Vercel now compiles Python functions to bytecode during the build step rather than at first import, dropping median-function cold starts from 2.8 seconds to 1.3 seconds in their benchmarks. Python serverless cold start has been the main reason teams pick Node for edge functions; a 54% reduction narrows that gap materially. Immediately actionable for anyone running FastAPI or Flask on Vercel — the win requires no code change.