Blog · Node.js
Node.js event loop: production pitfalls and fixes
Published 2026-01-26 · 8 min read
CPU blocking, long synchronous work, and logging overhead can stall Node.js—here is how teams diagnose and fix production latency.
Pitfalls
Heavy JSON parsing, synchronous crypto, and unbounded in-memory operations can block the event loop and spike tail latencies.
Microservices still need discipline within each process.
Diagnostics
Use tracing, event loop delay metrics, and CPU profiling on representative workloads—not only local laptops.
Fixes
Offload CPU work to workers, stream large payloads, and cap concurrency with backpressure.
Frequently asked questions
- Is Node “slow”?
- Often misconfigured; measure before rewriting—many issues are algorithmic or architectural.
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