Don’t downvote, it’s a really good question. Naively, I’d also have expected Rust to be faster, given the same algorithm. My guess is that without a GC, the Rus

Don’t downvote, it’s a really good question. Naively, I’d also have expected Rust to be faster, given the same algorithm. My guess is that without a GC, the Rust solution can’t delay deallocating all those temporary strings (both variants seem to allocate a string for each word, though I’m not sure if Go doesn’t simply share string slices). GCs free memory in batches, which is often more efficient, and sometimes don’t have to do it all on process exit. The Rust code meticulously deallocates each string individually.