I haven't looked since, but jemalloc I believe was a significant cost in this. Recently there was a change merged in to use the system allocator by default: ht

I haven't looked since, but jemalloc I believe was a significant cost in this. Recently there was a change merged in to use the system allocator by default: https://www.reddit.com/r/rust/comments/9twam5/jemalloc_was_just_removed_from_the_standard/ https://www.reddit.com/r/rust/comments/9twam5/jemalloc_was_j...