Title reminded me of something completely unrelated: FFI overhead is not to be neglected sometimes. I've seen cases where replacing a python or js lib with an

Title reminded me of something completely unrelated: FFI overhead is not to be neglected sometimes. I've seen cases where replacing a python or js lib with an in isolation much faster native Rust or C lib with bindings had the end result being a decrease in real-world performance due to it being in a hot path or loop and the overhead being more significant than the savings were. There is no substitute for real-world benchmarks.