Hey,

having an operation that heavily utilizes CPU and RAM, nothing else (no 
IO), but it is a main bottleneck, then it never pays off using 
`stream.mapAsync` for it unless you batch operations by something like 10 
000, so I started using stuff like :

.map(operation).withAttributes(
    Attributes.asyncBoundary 
      .and(Attributes.inputBuffer(16,32))
      .and(ActorAttributes.dispatcher("pinned-dispatcher"))
    )

that is usually at least 3x more effective than `mapAsyncUnordered(4)`, but 
it still utilizes only one CPU core.

Can you think of anything better than this or how to improve the above ^^ ? 

*One way would be probably to split the flow into 4 substreams which would 
lead to utilizing 4 cores, right ? So is akka.stream.scaladsl.Balance the 
way to tackle this challange? *

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