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Node.js worker_threads: Moving CPU-Bound Work Off the Event Loop, Measured Speedup and Error Handling

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Self-Hosting & Infra intermediate 6 min read $0.01 Updated 2026-10-20

Executed on Node 22: a 300-million-iteration loop taking 249 ms alone and 346 ms for four copies in parallel workers, zero timer ticks while the main thread was blocked, and a worker exception surfacing as an error event on the main thread.

One heavy loop freezes every request in a Node server. Measure it, run the same work on four worker threads, see the speedup, catch worker errors, and know when threads are the wrong tool.

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#nodejs#worker-threads#performance#event-loop#concurrency

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