Right yeah- what we should be doing is having benchmarks being run against develop and against any feature branches if there's a question of performance regressions/enhancements. In any case, this has been shown so yeah there should be no need to have two implementations (or even the old jRhoW method?). 

There is the question of the scalacheck tests though- should we just then keep around the jRhoW method as a sort of reference implementation?