There is a small delay when I switch rigs in performance mode. The effects switch instantaneously, but my different rigs have this short audio drop before making the switch. Anyone else with this issue? I've read that it is supposed to be instantaneous.
are you connected to RM at the time?
I think I remember someone saying that this only happens when connected to RM. Check it when not connected to a computer and see if it persists.
You can also experiment with Rig X-Fade Time.