Blog

Nginx handles hundreds of thousands of connections with 4 cores. Here's why: event-driven epoll loops, 11-phase HTTP pipelines, pool allocators, and a master-worker model built for zero-downtime reloads.

PostgreSQL trades storage space for concurrency — MVCC, WAL, and vacuum aren't quirks, they're the design. Understanding this explains most performance mysteries.

Redis is fast because of specific design decisions — a reactor-pattern event loop, copy-on-write snapshots, compact in-memory encodings — not just because it's in-memory.

From BGP Anycast routing to tiered cache hierarchies and Surrogate-Key purge — how CDNs actually move traffic from your origin to the nearest edge server.

HTTP/2 replaces ASCII text with a binary framing layer and multiplexes dozens of requests over one TCP connection. Here's what actually happens at the wire level.

TLS isn't just a padlock — it's a carefully choreographed cryptographic handshake. Here's what actually happens between your browser and the server, with the openssl commands to see each step yourself.

DNS translates domain names to IPs via a hierarchical delegation tree. Here's what actually happens between typing a URL and your browser connecting.