Rust: The Dangers of Early Performance Optimization

In this video I "reply" to Vagelis Prokopious's video comparing a highly optimized Vert.x web server vs a non-optimized actix-web web server. I optimize the actix-web to restore the honour of Rust. But did I waste my time? Isn't the "real" bottleneck in the network rather than the choice of programming language? NOTE: My discussion about how Serde Json works is theoretical. I have not deeply inspected the code and there are probably many optimizations done in Serde_Json. Vagelis Video:    • Web api benchmarking: Java (Vert.x) vs Rus...   Original Code: https://github.com/Vagelis-Prokopiou/... Optimized Version: https://github.com/masmullin2000/yt-w... Hetzner: https://www.hetzner.com/