Why Is Redis So Fast? Explained in 5 Minutes
A normal database query takes 10 milliseconds. Redis does it in under 1. Here's the 3 design choices that make Redis over 10x faster — explained simply, in 5 minutes.
Redis is everywhere in modern backends — caching, sessions, leaderboards, rate limiting — and it's famous for being fast. But why is it so fast? In this video I break it down into the three core decisions behind Redis, in plain language.
What we cover:
→ Why keeping data in memory beats reading from disk
→ How running on a single thread makes Redis faster, not slower
→ Why Redis skips tables and uses purpose-built data structures
→ When to use Redis vs a traditional database (and why most apps use both)
No prior Redis experience needed. If you've ever wondered what's actually happening under the hood, this is for you.
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Tags:
redis, redis explained, why redis is fast, redis tutorial, in-memory database, redis vs postgresql, caching, system design, backend development, database performance, redis caching, software engineering, redis for beginners