It wraps the F# MailboxProcessor mentioned in a comment above. A thread is only allocated when a message is processed, and then free'd up afterwards. So there

It wraps the F# MailboxProcessor mentioned in a comment above. A thread is only allocated when a message is processed, and then free'd up afterwards. So there's no permanent thread overhead and 100,000s can be created. The overhead in terms of memory is the internal state of each Process + the user's Process state. To see the internal overhead, check out the member variables for the Actor class [1]. It's pretty lightweight, although could probably shave a few bytes here and there. [1] https://github.com/louthy/language-ext/blob/master/LanguageExt.Process/ActorSys/Actor.cs https://github.com/louthy/language-ext/blob/master/LanguageE...