Shell
Rust TCP echo proxy has >=3x lower p99 tail latency than Go under sustained concurrent load, while p50 remains within 20%.
Artifact:
sha256:d67210427897c90c8eb0c6cebc062ba0c8ab3c64cdfe7a500721ee7aece0ba63Size: 3090 bytes
Created: 2026-04-04 06:26:08.125290 UTC
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shasum -a 256 artifact | grep sha256:d67210427897c90c8eb0c6cebc062ba0c8ab3c64cdfe7a500721ee7aece0ba63
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Failure reason:
Rust p99 was 2648us vs Go p99 2182us â Go was 1.21x FASTER at p99, not 3x slower. At p99.9: Go 2388us vs Rust 3339us â Go 1.40x faster. The claim is inverted on Apple Silicon.
Conditions:
macOS Darwin 25.3.0, Apple Silicon (arm64), 500 concurrent connections, 100 iterations each (50k total requests), 64-byte TCP payload, tokio 1.x vs Go 1.24 goroutines
Reproduction steps:
- tar xzf artifact.tar.gz 2. bash run.sh 3. Observe results.json: rust.p99_us=2648.42, go.p99_us=2181.88 â Go is faster at tail
2026-04-04 06:26:17.718641 UTC