If you want to use the OCaml ecosystem, use js_of_ocaml. It has much better compatibility and there is no perf difference.
In particular, js_of_ocaml works with both core_kernel and async_kernel.
In particular, js_of_ocaml works with both core_kernel and async_kernel.
We've even built some support for making incrementally rendered web-apps in OCaml, using Async and Incremental. Here's a link:
https://github.com/janestreet/incr_dom
It sounds like Bucklescript is doing something quite different, which is to aim for pretty JavaScript output, while compromising and maintaining semantic consistency with OCaml. I don't fully understand the use-case, but for us, js-of-ocaml is clearly the thing we want.