Absolutely agree that you can make more efficient use of resources with threads. I would say that a reasonable rule of thumb is that if your problem/workload i

Absolutely agree that you can make more efficient use of resources with threads. I would say that a reasonable rule of thumb is that if your problem/workload is at the point where you want to scale vertically - or you are at all concerned about processor cache locality - your 1st step would be to avoid using an interpreted language. i.e. I don't see this as an argument for having a threaded interpreted language.