The term « erlang expert » made me wonder : since erlang is supposed to be a much saner and stricter architecture ( share nothing, code inside the actor in a sy

The term « erlang expert » made me wonder : since erlang is supposed to be a much saner and stricter architecture ( share nothing, code inside the actor in a synchronous manner, etc), what are the usual troubles someone encounters performance-wise in that language ? Apart from a particular cpu intensive task that would make just a single request perform badly, it seems ( from just reading about the language) that just following the guidelines ensures top performance.