Node.js worker threads help alleviate performance issues by executing CPU-intensive tasks outside the main event loop, improving scalability and reducing memory usage. They enable efficient data exchange using message passing and offer enhanced reliability in case of thread crashes. By splitting CPU-intensive tasks into individual threads, developers can improve application efficiency and handle a higher volume of traffic.
The article demystifies JavaScript’s event loop—its call stack and task queue—and how a single-threaded engine achieves concurrency by scheduling callbacks, promises, and async/await to handle I/O like AJAX and timers without blocking. It offers best practices (avoid blocking, use Web APIs/workers), a simple XHR example, and a chat-app use case to keep UIs responsive, scalable, and real-time.
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