Do manuals mention how to program Performance Mode (wiki is inaccessible) !

Refer to the Addendum Manual that comes with every update, there's a dedicated chapter regarding Performance Mode. To get started: Choose a slot, turn Browse knob, choose Rig. Choose next Slot, repeat the aforementioned steps. Press Slot enable when filling slots 2-5. Store Performance.

I think it's easy. Go into performance mode. It will load a default performance. Then use the browse knob to load the Rig you want to use. Press store, give it a new name and press store again. So the performance is stored with your wanted Rig. Then you have to enable the other slots. You can copy the first slot to another slot and then make your adjustments. Don't forget to store after you have made your settings.