Rust in Production: Lessons After Two Years

Mon, 25 May 2026 00:00:00 +0000

Two years ago we rewrote a Go microservice in Rust. Here’s what we learned—the good, the ugly, and the surprising.

The Numbers

Before we get into opinions, here are the cold hard metrics comparing the Go (1.21) and Rust (1.78) versions processing 10M API requests:

Metric	Go	Rust	Delta
P99 latency	340ms	28ms	-92%
Memory (steady state)	2.1 GB	48 MB	-98%
CPU (avg)	4.2 cores	0.8 cores	-81%
Binary size	12 MB	4.8 MB	-60%
Lines of code	4,200	5,800	+38%

The latency drop isn’t just about Rust being faster—it’s about tail latency predictability. Go’s GC pauses, while short, created sporadic spikes that triggered downstream timeouts.

Performance on Neputer Blog

Rust in Production: Lessons After Two Years

The Numbers