Hi Guys, I'm and Admin having customers with simular issues, and no matter how much cpu, SSD ect QB 2020 sucks, I even placed the QB file into a RAMDISK and no go still the same speed so I decided to look someplace else and here are my findings:

I took the computer and changed the gateway address to 0.0.0.0 (no outside access) guess what, 5min to open quick books, now why do you think that would be? Well my thoughts are that QB Desktop is having to check in to QB for some reason, and on the day's its running fast such as a sunday few users trying to use QB, on M-F lots of users QB servers congested.

So my guess is that when opening a file some handshake is taking place with QB now that did not occur in older versions of QB, hope this helps if we can track down what its doing maybe we can trick it into not needing to check in.