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Bun

A faster event loop with an instant start, so it autoscales and deploys better than Node.js. 60 MB and no startup. Less mature: a package that works on Node.js can break on it.

Trade-offs#

Axis	Score
Throughput
Tail latency
Memory
Velocity
Resilience
Operability

Frameworks#

Express
Fastify
Next.js
NestJS

Engineering terms#

Event loop
Cold start