CEGUI has proven to be a difficult beast, mostly because of the difficulty of finding documentation. Constantly changing versions and the difficulty of finding examples and documentation to match that particular version do not help the situation either.
Well, I got it working anyhow, see
and the FPS window shows real time performance data from the client.
I have been building performance tuning mechanisms in the system as I go. I believe it will prove useful later on, compared to the approach of first building a system and later on wondering how it could be controlled.