Created docs/PERFORMANCE_TESTING.md with comprehensive coverage of:
- Running benchmarks (make bench, make bench-quick)
- Running specific benchmarks
- Understanding benchmark output (ns/op, allocs/op)
- CPU profiling with pprof and flamegraphs
- Memory profiling
- User diagnostics (bd doctor --perf)
- Comparing performance with benchstat
- Optimization tips and common patterns
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
