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I Didn’t Mean to Build a 5.4M msg/sec Monster, But Here We Are

In .NET Tags #performance #copilot #optimization Published 2/21/2026

I thought I was just updating an old hobby project. Instead, I fell into a week‑long optimization rabbit hole that turned a clunky GPS parser into a zero‑allocation, 5.4‑million‑messages‑per‑second monster. This is the story of four rewrites, a lot of mistakes, and the surprising things I learned about modern .NET along the way.