since a while my viewports started stuttering or even freezing, also without much geometry (just some lines for example).
and if I move some command pallets they pull slowly behind. this issue seems to occur in all viewport but specially in perspective view.
rhino 5 64 bit latest update
windows 7 professional
intel core i7 3770 cpu @ 3.4 GHz
32 GB RAM
Nvidia GeForce GTX 680MX 4GB