SelVolumePipe freezes Rhino 6.35 and 7.14

When I run SelVolumePipe command and choose Crossing or InvertWindow option, Rhino freezes for at least 20 seconds. If I press Esc key, the Rhino window becomes bright and sometimes Rhino starts working again. Sometimes the Esc key does not work and I have to use Windows Task Manager to stop Rhino.

Hello- it is a pretty slow command. I can imagine it takes a while in sorting through any large number of candidates.