I normally don’t use 3d objects in elevations because Design really slows down when I do, but I find it is really helpful to use when making door and drawer counts.
I noticed that when I open the preferences panel to turn off the 3d objects in elevations and the elevation window is still visible, the elevation window visibly redraws several times before the preference panel opens.
I wasn’t sure this was what was supposed to happen, but I thought I would point it out.