I have a 2013 mac pro with the best gpi option at the time D700 dual.
Running ethminer with -G -t 2 I get somewhere between 19-21Mh using a pool. (I installled the cpp ether from brew).
Is the speed ok for this machine? Benchmark I get 25mh i think.
On dwarfpool I see only 6mh and i also get a red warning about hash below threshold:s
Any other setting that are useful for macOSX?