Mike Chen's Internet Architecture

Dec 11, 2025 · Backend Development

Why Redis Delivers Microsecond Latency: Memory‑First, Single‑Threaded, and I/O Multiplexing

Redis achieves sub‑millisecond response times by storing all data in RAM, using a single‑threaded event loop with I/O multiplexing (epoll/select/poll), and employing highly optimized data structures such as skip lists and hash tables that provide O(1) or O(log N) operations.