How one thread, a smart event loop, and non-blocking I/O let Node.js handle thousands of requests without breaking a sweat. When someone tells you "Node.js is fast," they don't mean it runs JavaScript faster than other languages run their code. JavaScript will never beat C++ in raw computation speed. That's not the point. What makes Node.js fast is how it handles waiting . And in web applications, the server spends most of its time waiting — waiting for database queries, waiting for API responses, waiting for files to load. A traditional server wastes resources during that wait. Node.js doesn't. That difference is why companies like Netflix, PayPal, and LinkedIn moved to Node.js and saw dramatic performance improvements. Let me explain the architecture that makes this possible — it's one of the most important things I've learned in the ChaiCode Web Dev Cohort 2026. What Makes Node.js Fast? Node.js isn't fast because of magic.…