<i>&gt; Personally, if the OCaml multicore work ends up slowing down the core runtime appreciably, I&#x27;m going to be upset</i><p>That&#x27;s what I meant in my original post about multicore seeming controversial. That&#x27;s part of the reason that for me, a super-speedy single-core Ocaml coupled with an industrial strength OTP-style distributed computing framework, would be awesome. I&#x27;m actually not that excited about multicore. My use case is lots of streaming data coming in, needing to be parsed, lots of heavy lifting stats work done in real time, then distributed to clients. So it needs both very high performance on the single thread (currently using GPU-accelerated calls to Numpy), and then very efficiently be able to distribute heterogenous data to lots of endpoints. I really would love to be able to do it all in Ocaml.