You still need to write non-consing code to avoid memory allocation/deallocation latency, just as if you were working in Java, Lisp or OCaml.

(In fact, GCs can often give you better latency than malloc/free unless you go into custom allocators with object pools... which is part of writing non-consing code in GCed languages)

Ah you're right, I forgot about OCaml's ass-tier multicore support. Rust is definitely better there.