It would be nice if the continuous highlighting of everyting that one mouses over could be turned off.
Preferably as a general UI setting that is not file dependent.
Not only is this continued highlighting one of the slowest UI things in general as described in this thread but it can be really annoying when trying to join, or align components in a more compex assembly where many surfaces are candidates for selecion and highlighting.
A good place for a toggle option would be here: