To be honest, though, this is the result you really should expect. Node.js is a relatively new thing that is a bit of a clever hack on top of a language runtime that is powerful but was not directly designed for this usecase, running a language that is also powerful but not directly designed for this use case. Erlang is a language that has been open source for 12 years (and was actually started in 1986), both the language and the runtime are specifically designed for this use case and has had years of tuning and bugfixes, and this problem is right smack dab in the middle of what Erlang targets.

This isn't a criticism of Node.js... it's just the way it is. Every language was young sometime.

(It will be interesting to see if Node.js ever quite catches up, though; when you've really pushed the performance to the max for a given design decision, you get down to the point where you can't improve without changing those decisions. Erlang's GC, for instance, is absolutely written around having a lot of threads that may be running on different CPUs, which adds a lot of complexity that the V8 project, or any JS runtime project in general, may be loathe to introduce into what is still fundamentally something that should be able to go into a browser. But that's for the future to resolve.)