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by steveklabnik 983 days ago
jemalloc was not the default on every platform, but was on some. It adds a non-trivial amount of binary size to every program, even ones that don't need the performance boost, and that is an area Rust is often criticized vs C.

That said, there are a few reasons beyond just that. For the primary sources: https://github.com/rust-lang/rust/issues/36963