I have downloaded the trial version of rhino on my MacBook Pro 2018 15 inch.
Very simple polysurfaces and simple grasshopper commands are extremely slow.
Any tip for a mac user?
What MacOS are you running?
Catalina 10.15.5 is the current public release.
FWIW, I was using a 2010 MacBook Pro until recently and I never noticed any performance problems with Rhino.
We are seeing problems on High Sierra and they seem to be getting worse.
Also unrelated, Steve made a recent change that will make it to the V7 WIP in another few weeks that helps a lot with curve drawing performance.