When the trace reference is from the view map and not the project map then then essentially two layer combinations are used to display the elements on your screen. In this case differing intersection groups in the two layer combinations can incur heavy performance penalties.
A workaround to improve responsiveness is to duplicate the two layer combinations used and in these two temporary layer combination sets make sure all of the intersection groups are set to 1. Understandably while you work in this “optimized” trace environment intersections will not appear as you desire, but your ArchiCAD will be considerably more responsive.
Hope this helps,
Graphisoft Technical Support