Does the behavior continue in Shaded or Wireframe display mode or does it improve?
I’ve experienced similar issues when viewing in other modes (especially Ghosted or Rendered). Seems the graphics card just can’t keep up. I should boot into WinRhino in Bootcamp (on the same machine) to see if the behavior is similar, but I sort of recall it being a bit better for some reason on Windows side.
As for Zoom Selected, I use this only about 6 million times a day. Would actually prefer if this were default behavior (especially helpful for orbiting), but creating a custom shortcut (Control + Z) seems to be a bit quicker than typing ZS. ~Dave