This is specifically about navigation in a 3d perspective OpenGL view, using a 3dconnexion wired Spacemouse Pro device.   It's not a problem with simple models. However, on two separate, relatively large/complex models drawn in VW2018 and imported to VW2021, I find that navigating them with the 3dconnexion device is considerably less smooth in VW2021 than it is in VW2018. There is a lot of jerking and stuttering.   Given that 2021 is supposed to have had various improvements