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Lambda is slow on the first request, fast after

Cold start is the time to spin up a fresh sandbox. Optimize or accept.

Try this first

  1. 1Shrink deployment package, fewer deps = faster
  2. 2Avoid heavy init code, lazy-load what you can
  3. 3For latency-critical: Provisioned Concurrency, but it costs
  4. 4Consider ARM (Graviton2) runtime, often faster and cheaper

When to bring us in

If you need sub-100ms, Lambda may simply be wrong, look at App Runner or ECS Fargate.

See also

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