Why Redis, Nginx & Netflix Use a Single Thread to Handle Millions of Requests

Have you ever wondered why Redis, Nginx, Node.js, or Netflix’s Zuul — some of the world’s fastest systems — proudly call themselves single-threaded? Doesn’t more threads mean more speed? Not always. In this video, we’ll break down the myth of multi-threading vs single-threading, and uncover the real power of event loops — using simple analogies, visuals, and a demo comparing both architectures. You’ll learn: What single-threaded really means (and what it doesn’t). How event loops help systems handle thousands of requests efficiently. Why context switching is the silent performance killer. How tools like Redis, Nginx, Node.js, and Kafka achieve massive throughput. The pros & cons of single-threaded event loops. A live demo comparing event loop vs thread-per-request model. By the end, you’ll truly understand how “one thread” can outperform thousands — and why this design powers the fastest web servers and APIs on the planet. If you find this helpful, drop a 👍 and share it with your tech friends. Comment what you want next 👇