Smart Guard: do not snapshot all VMs at the same time

When my MacPro starts with 20 virtual machines in Parallels, after few minutes delay, for all the virtual machines parallels starts to delete old snapshot(s) and create a new snapshot. This is for all the virtual machines (if they are running or not) at the same time! Then this gives so much high disk I/O that it will take hours before the snapshots are taken, instead of a few minutes if it was done one by one.

So please provide some more options to set when the smart snapshot should be taken for each virtual machine. For example only during night time and/or after starting Mac set delay minutes for each virtual machine to start taken new snapshot.