[fedesilva]

I would say that is because neither you nor the original authors had an idea of how things work (thread scheduling, etc).

Good for you if you rewrote it and it did solve your problems. Obviously it was not such a huge task, if it was, learning how to control those things would have been wiser.

In this specific case 'dispatchers' is what you were looking for (http://doc.akka.io/docs/akka/snapshot/scala/dispatchers.html) and it is quite flexible.