Performance? Well that is a whole different topic and one I do not know much about. I go on rides, try to work a bit and typically look at my average MPH to get a sense of how my workout compared with yesterdays on the same route. I would enjoy playing with the Garmin GPS and the heart rate monitor to get a better idea of my progress.
I did work out some details about cadence in a post a while ago. Here is the link:
As discussed in the link, for a (fixed gear) 36" unicycle,
cadence = 9.58 X MPH
OK, I just saved you $60 for that cadence monitor.
You are welcome.
Scott