[Fiahil]

I think you misread :

- 2 actors on 1 thread = OK

- 1 actor on 2 thread = you are probably doing it wrong.

As for the rest, whether or not they are used in communication systems and whether or not they are cpu-bound, consider there are and run the handle on a separate loop from the main message dispatching. Otherwise you _will_ delay messaging if handles don't await.