Ocaml can be extremely performant - both in terms of throughput and latency - in the single-threaded case. There's a particular set of problems where Ocaml's pe

Ocaml can be extremely performant - both in terms of throughput and latency - in the single-threaded case. There's a particular set of problems where Ocaml's performance is bottlenecked without multicore, but that's far from most. Anecdotally, I once worked at an Ocaml trading firm - where microseconds could matter! - and at least at the time, folks there weren't particularly interested in multicore. We have async/lwt already, and we spun up multiple processes for parallelism. A 10% performance drop for multicore support that we didn't need would have been unacceptable for us.