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AWS Lambda cold starts with a Node.js function — how to reduce them?

asked 14 days ago420 viewsen

2

My Lambda has noticeable cold starts (~800ms). Bundle size is 4MB. What are the highest-impact fixes (provisioned concurrency, bundling, runtime choice)?

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nodejsaws
asked 14 days ago

  • Thanks, this helped. Did you also try clearing the cache?

     — marielouis 5 days ago

1 Answer

6

Biggest wins in order: (1) bundle with esbuild and tree-shake to shrink the artifact, (2) move heavy init out of the handler, (3) provisioned concurrency for latency-critical paths. Runtime choice matters less than bundle size.

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answered 14 days ago

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