Performance Optimization

Performance Optimization\n\nRust already produces fast code. For further tuning:\n\n- Use cargo bench for benchmarks.\n- Profile with perf or valgrind.\n- Inline critical sections with #[inline(always)].\n- Prefer stack allocation over heap when possible.\n- Avoid unnecessary clones; use references.\n\nrust\n#[inline(always)]\nfn fast_sum(v: &[i32]) -> i32 {\n v.iter().sum()\n}\n\n