Performance

The mental model behind Rust performance work: what "zero-cost abstraction" actually promises, why allocation-awareness is a habit rather than a rule, and when to profile instead of guess.

Measure first and the zero-cost mindset.

Iterators, generics, and what compiles away.

Borrowing, `Cow`, and ownership design.

`strip`, `panic = "abort"`, and size profiles.

Optimize the measured hot path only.