NestJS · Senior · Question 59 of 75

Why should long CPU-bound work not run in a Nest request handler?

✓Correct answer: Nest runs on one Node.js event loop; CPU work blocks all requests. Offload it to worker threads or a queue worker
2Handlers have a hard 1-second limit
3Nest automatically moves CPU work to threads

Explanation

Watch event loop delay; a single slow handler raises latency for everyone.

Further reading

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