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That's just not true. Before you would run into all kinds of bottlenecks after 2-4 cores. I believe it was addressed in R13A[1].

Not after 2-4 cores. And R13A is 2009, that was 10 years ago. (Java 8 is 2014.)

Today’s Erlang (R22) MP support is practically the best, bar none.

Hence the past tense.