Rust Performance

Define the workload, build profile, target CPUs, and performance claim. Measure CPU/allocation behavior before changing the limiting path. Check changes against the declared MSRV, edition, panic behavior, and overflow semantics.

Read [measurement and build][ref-1] for profiling, Cargo profiles, and PGO. Read [ownership and concurrency][ref-2] for allocation, layout, unsafe, atomics, and SIMD.

Remove redundant work and copies before adding unsafe or concurrency complexity. For unsafe operations, establish caller preconditions, aliasing, alignment, initialization, bounds, and lifetime. Enforce CPU feature requirements with runtime dispatch when distributing portable binaries.

Run relevant correctness checks and repeated before/after measurements under identical build and workload conditions. Report measured scope and variability. Identify unavailable soundness or target checks without treating compilation as proof.