A new analysis of the Rust programming language reveals that its memory safety features typically impose a modest performance penalty of 3-4% compared to C++, while remaining highly competitive overall.
The study, published in a presentation titled "Rust Performance," examines the balance between safety and speed. Rust's mandatory runtime checks, such as bounds checking, ensure memory safety but add overhead. However, developers can mitigate this using iterators, slicing, or unsafe blocks.
The language's borrowing system also enables the compiler to perform more aggressive alias analysis, reducing pointer ambiguity and potentially improving execution speed. This helps Rust maintain performance parity with C++ in many scenarios.
The sources conclude that Rust offers a robust compromise between high-performance systems programming and modern security guarantees. The findings come from slides comparing Rust to C++, highlighting zero-cost abstractions and sophisticated compiler optimizations.