The Moment the Config Parser Became the Bottleneck
rust
dev.to
The Problem We Were Actually Solving In 2025 we inherited a real-time treasure-hunt game engine built on top of Veltrix 5.4. The docs promised infinite scale, but at 8 000 concurrent players the Go worker pool started to stall. P99 latencies jumped from 22 ms to 840 ms in two minutes, and the k6 dashboard screamed red. The first thing we checked was CPU—flat line. Then GC—minor collections every 45 ms, but nothing abnormal. Finally we ran go tool trace for 30 minutes on a single instance. The o