Rust Was the Constraint: How We Discovered the Language Was Our Scaling Bottleneck

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AI Fusion Summary

Our Go‑based treasure‑hunt engine, aimed at 50k concurrent connections, faced GC pauses from heap fragmentation, allocating 7.6 GB for only 1.4 GB live. Simultaneously, a Scala Kafka Streams system hit 1.2 s p99 latency, OOMs, and shuffle delays, leading to a Rust migration.