Thanks Joe, well this guy specialist in Photoshop printing etc, and he said he had all sorts of problems, (maybe not the beachball , but other things from using migration assistant, and heard from many others.. issue being Intel to M1..)

My beachball issue, not long 1 min ones you had day... just 10 sec, but it is everyday, so might be worth it to do a clean wipe and manually add everything back slowly over while.. see how goes. You concur? Especially since, don't think ever done it since my first Mac G4 got in 1998.. my guess. Kind of sad, as working fine with the older 6 year old 27", but alas... maybe it is M1 system..

That said, so preparing: if in my shoes, would you recreate all preferences, or some so tedious you might try to bring over on case by case, for example Mail: with the accounts and the rules is nasty one to redo..

Passwords.... go over that...keychain... besides internet, what are passwords, I've taken for granted on keychain for so long, might not even be aware of them any more.. have few examples of what keychain is saving me time on my mac (again beside internet sites) . And if I wanted to manually bring over later keychain.. how to do.. but Keychain, would probably be a good not not to bring over right.. just cleanse it out, and rebuild it slowly over time?

Contacts, and many other icloud thing, no worry, all in cloud. But lot other little thing oh well....

As for discussion in internal SSD, being ok now for Data, you agree, I should have gotten then 2TB on internal... of course, not too late, have wait the 5-6 years until buy next machine..