When working in drawings with LOTS of data the selection of a subentity to a object (ie. a surface label or a single point) can significantly decrease preformance. It is possible to toggle between the ability to select subentities or the selection of the main object only. The two commands that toggle this ability are:
DISABLESUBSELECTION - Turns off the ability to select subentities.
ENABLESUBSELECTION - Turns on the ability to select subentities.
Seems like an ideal case for custom Toolbar Buttons or Tool Palette tools.