Hi Ben,
I was able to test MF 3.2.2 with iOS 9.0.1 on my Air 2 and other than the little lags you mentioned at the initial start-up of MF, it runs just fine, on the current versions for me. Those little issues are negligible, IMHO. No biggie there.
Now that iOS 9.0.2 has just dropped, for experiment sake, I’m going to test it with MF 3.2.2 to see what, if any differences show up. Shouldn’t make any difference though.
Addendum to this post:
Just tested with iOS 9.0.2 and there is still the same "load delay" of MF in my case up to 14 seconds for it to become responsive to touch on my Air 2 and erratic
still on my old iPad 2. Once the delay is over, on my Air 2, it works just fine. This start up delay is not a deal breaker at all.
I am how ever waiting for MF 3.2.3 to drop, just the same.