Nonsense. F# has a better async story. Javascript is also good.

After dealing with F#'s Async in production, I'm not sure I'd prefer it to the TPL. There are plenty of performance and efficiency problems and the expressiveness is also a double edged sword (we found lots of programmers had issues getting a good intuition around evaluation vs definition time and even very experienced F# devs would get surprised).

Part of it is not necessarily the design F# took but that the TPL is incompatible enough that the mixing of TPL-centric .Net libraries becomes a problem. It might be wise for F# to support the TPL via computation expressions with something like `task { ... }` (there are a few implementations out there but a compiler supported state machine generator would be more ideal).

davidgrenier

If I may, I'd like to invite you or someone on your team to read a couple of chapters of John Reppy's Concurrent Programming in ML and try Vesa's excellent delivery in https://github.com/Hopac/Hopac.

I'm not clear if you absolutely have to use TPL but CML is likely just a better model for tackling concurrency and Hopac is orders of magnitude more efficient than F#'s async.