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Re:Go hits the concurrency nail on the head by notriddle on Thursday October 04, 2018 @03:31PM (#18142919)
The BEAM is already much more performant than, for example, the Ruby reference implementation. And look at what people have managed to build with Ruby!
Re:Go hits the concurrency nail on the head by jashmatthews on Thursday October 04, 2018 @05:06PM (#18143673)
Erlang 19 is only 10% faster than CRuby 2.3 on a simple factorial bench. Web throughput is even closer as lots of it is C extensions.

I haven't made the comparison myself for a while but I suspect it's still very close.