Profile GPU under macOS?

I tried the console command “r.ProfileGPU.ShowUI” but nothing happens, I press enter and the console vanishes without showing the profiler. Any suggestions?

I am running UE 4.15 under macOS Sierra 10.12.3 on a MacBook Pro 15" 2016:
2,6GHz i7, 16GB Ram, Radeon Pro 450 2gb