The answer
Tuning and monitoring: tune UV_THREADPOOL_SIZE, monitor event loop lag, profile CPU usage, and use clinic.js for diagnosis. These turn understanding into practical performance optimization for production Node.js apps.
A Roadmap to Understanding Threading in Node.js
What is the last step in the Node.js threading roadmap?
More FAQs in A Roadmap to Understanding Threading in Node.js
In order: the single main thread, non-blocking I/O and the event loop, the libuv thread pool, CPU-bound vs I/O-bound work, worker threads, and tuning and monitoring. Each step builds real understanding of how Node.js handles concurrency.
That JavaScript runs on a single main thread. The event loop processes callbacks here. Blocking the main thread is the biggest performance issue. This is the foundation for understanding everything else about threading in Node.js.
After understanding non-blocking I/O and the event loop. The thread pool handles operations that cannot be done async by the OS, so it builds on your understanding of async I/O. Learn UV_THREADPOOL_SIZE and which operations use the pool.
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