From my point of view as a Rhino support tech, I think that’s fine but you have an outdated reaction.
Yes, nVidia slows down the GeForce cards when they detect “CAD” OpenGL calls.
AMD didn’t used to for their Radeon cards. In late 2013/early 2014, they “broke” the drivers and problems started to appear. For a couple years, we could tell people to revert to older drivers and/or turn of antialiasing in Rhino to get them working again. Recently AMD took down the link to old drivers.
The AMD FirePro cards (intended for OpenGL), are fast but don’t have good antialiasing.
nVidia Quadro card are expensive and don’t work well with default settings in Rhino V5.
AMD Radeon cards are now unusable. Your only option is to turn off accelerated hardware modes in Rhino.
nVidia GeForce cards while not as fast as they could be, seem to be the best compromise between reliability and price.
Intel HD 3000 and earlier chips are unusable. Turn off accelerated hardware modes in Rhino
Intel HD 4000 and newer chips are slow, but generally are functional with current drivers.
The plan is to make Rhino V6 display aware of newer OpenGL specifications and use the newer specification where possible. The development is being worked on now. So far I haven’t seen any speed improvements in internal testing, but that performance work has not happened yet. It’s just too soon.