I agree with terich. I was on OS 7.1.18 and when switching between any of the 5 different slots of the same performance, I always had a latency before the choosen rig took effects. The latency varies between 158 and 570 ms, wich is not adequate when you want to switch between different parts of a song. Made differents tests, with or without rig spillover, with midi control instead of the remote, compared with other analog midi switching to make sure it's not the guitar player . I finally reverted to the latest official release 7.1.15 and latency disappeared.
I hope it will be fixed before the release of RM 3.
Switching slots takes longer when Rig Manager is connected. The reason behind this is, that all changes need to be stored when switching to another slot. This didn't happen before and for obviously reasons, it troubled loads of users. We assume that when you have Rig Manager connected, you want to edit things and keep you edits.
If you want the slots to switch fast (and not store changes) then you need to disconnect Rig Manager.