I don’t know how you tested, but on my system Cubase performance is so much better than both logic’s and studio one’s. and I am on OSX Mojave and mbpr 2016
For example, Cubase can handle 4 instance of Roland’s System-8 playing 2 voice super saws at the same time while logic 10.4.5 can handle only 1 instance and studio one only 3 of them.
I don’t even say about number of plugins that can be loaded in both daws. cubase just doesn’t leave a chance to all other daws. even reaper is way behind it. and I’m telling you, I was a big cubase skeptic for a long time.
your screenshot clearly shows disk overload. so performance wise it’s not cubase’s issue. you should better check your hardware issues before posting posts like this.