Performance

Reducing Read-Verify Hashing: Trust Earned by Real Verification

Verify-on-read re-hashes the full object on every local read (~8x slower than write). A ReadVerifier seam skips re-verification for blobs verified this process, while scrub still catches bitrot.

Perf Profiling Baseline: Measure Before You Optimize — and Keep pprof Off the Wire

Phase-0 profiling harness via go test -cpuprofile/-memprofile; Rule 75 forbids networked pprof on unauthenticated listeners. The baseline proved stdlib SHA-256 already uses AVX2.

⚡ Bolt: 1000 → 16 Allocations in S3 ListObjectsV2 XML

S3 ListObjectsV2 XML serialization dropped from ~1000 allocations to 16 per op via inlined time formatting and a pre-allocated escape buffer.

⚡ Bolt: Zero-Allocation and Hot-Path Engineering

The Bolt mindset codified: no heap escapes in hashing/encoding, deadline amortization cuts SetDeadline ~98%, allocation hotspots hunted by profile. Teaches: zero-escape patterns, measurement contracts, trade-off posture.

AWS Chunked Streaming: Signed Payloads Without Buffering

aws-chunked payload encoding streams large S3 uploads in signed chunks — no full-body buffering, per-chunk SigV4 integrity.