coder-rust-performance

<skill_overview> Keep Rust code fast while staying idiomatic Optimizing hot loops Reducing allocations Choosing data structures Measuring performance impact The Rust Book - Performance </skill_overview> <zero_cost_abstractions> Use iterators and closures freely; they compile to efficient code Prefer expressive, safe code and measure before micro-optimizing </zero_cost_abstractions> Prefer borrowing (&str, &[T]) over allocating (String, Vec) Pre-allocate with Vec::with_capacity when size is known Avoid unnecessary clones; pass references where possible let mut buf = Vec::with_capacity(1024); <hot_paths> Avoid repeated formatting or allocation in tight loops Reuse buffers and temporary values when possible </hot_paths> Benchmark with realistic data sizes Compare before and after changes <anti_patterns> Optimizing before profiling Cloning on each iteration Growing collections without bounds </anti_patterns>