Rust Profiling

Covers the full performance profiling stack for Rust: cargo-flamegraph for CPU profiles, cargo-bloat for binary size breakdowns, cargo-llvm-lines to catch monomorphization explosions, and Criterion for proper microbenchmarking. The workflow guides you through build profiles with debug symbols, interpreting flamegraph output with Rust's inlined frames, and the thin-wrapper pattern to reduce code bloat from generics. It also connects to perf and heaptrack when you need lower-level tooling. Straightforward and pragmatic. Use this when your Rust program is slow or fat and you need to figure out why.