Thanks for the suggestions, Noel. I will try them and let you know if they help.
BUT
Seems like turning off all the things that make the program Fast defeats the purpose.
The changes that Misha made in his video all seem to happen on the fly.
I want that.
(I have not opened RealBand yet. I don't ever use it. I used to use it for harmony generation, but that has change - since 2022 - and I don;t care for the new algorithm.
And I would REALLY like my BIAB to work like everyone else's...)
I totally understand what you are saying and I completely agree with you. My only interest is in finding out if something/anything helps your problem in any way or even creates a worse problem. This info would help development team home in on the problem you are experiencing. If it's bothersome to try please ignore my thoughts. I appreciate that I've probably gone overboard

(There was one stage in testing when it took my "new in 2023" i7 computer 14 minutes to generate a song. I have no idea how the problem was solved. I'm just passing on the settings that I ended up with when everything was working in the hope that they might be useful to you.)