I don’t know how you having this issue I been going from beta to beta install for 4 years never once formatted. I have late 2015 k as my daily driver take 1.5 min tops to boot up and log in and all that works great and this thing never has been in final release is. I junked on beta in 2016 and never got off the beta and it always upgrades fine and works grestzsI’ll be honest, on my 2015 late iMac it runs terribly. I did a clean install and very little installed and running but it takes about 5 mins to boot and be usable. It gets to the UI quick enough but once I’ve started logging in it’s another 4 mins before things will respond properly.
Tried stopping everything from loading at start up, no difference.
It could just be my Mac but Catalina didn’t have these issues. I keep debating about downgrading but it took me a few days to sort everything and keep praying the next update will sort it.
In addition applications take forever to load. It just gets stuck on verifying the application everytime.
I have m2 nvme ssd and second ssd replaced and 24 GB if ram, I can go 64 I needed also but no need for now and I never even reboot my iMac unless beta updated and it nice and fast.
All the issue oeoole have are foresee that’s outdated and computer full of junk and not well maintained end of story