I think Erlang is older than Ruby? (Not sure, but it's pretty old!) As for single threaded, they are not, even with green threads, IO is usually the problem (ot

I think Erlang is older than Ruby? (Not sure, but it's pretty old!) As for single threaded, they are not, even with green threads, IO is usually the problem (otherwise you chose the wrong language). As for static typing, there advantages and disadvantages to that, I wouldn't consider that a minus at all. A good engineering culture brings you in the same place with a dynamic or static typed language. Same goes for a bad engineering culture.