I can't really say I have. My apps still work, and appear to load and run as quickly as before. I speak as someone who uses his iPad for teaching in the classroom for hours on end, and in the very least, any possible performance degradation hasn't been seen or felt by me. So far, I have enabled display zoom to give me more viewing space (which has been pretty welcome). I have tried Stage Manager, but just can't seem to get the hang of it, so maybe I will wait till the weekend to play with it some more.
It just looks and feels a lot like when my iPad was on iOS 15.