Motu has also confirmed with us here, that with MAS VEP in our big orch template, when attempting to comp audio files, using 'show takes' on even two tracks with only 2-3 takes each can take 3 minutes to open. Removing all our 12 VEP instnaces from session, they open immediately. Sorta weird. But this does correspond to your beachball issue Dave, which we too, have confirmed.
I am sure Paul and the vundervar VEP peeps can address this.