Ok I may have a solution...finally!  Well,  in my case anyways.  So every since updating to Desktop Pro 2019 it has been awful and the system hangs up like crazy.  At least 3 reboots every time Im working in it.  So I started thinking the other day that I wonder if since I was storing my company file on a USB if that had anything to do with it.  Well, it had everything to do with it.  Ever since I moved the main file to the computer itself it has been life changing.  I was working off USB since I travel some and just wanted to kept the file mobile.  I also confirmed this with another company I work with.  We bought a brand new PC and Pro 2020.  I put the file on a USB first and it was terrible.  Once I figured out about moving the file to the main PC it reacted the same.  Once I moved the file to the PC itself it was perfect and great again.

Hope this helps.  I was on the phone with QB tech support and no one asked me about where the file was.  They wanted me to rename the old files and reinstall the new software.  This would have been a simple fix for them if they would have asked.  So glad I figured this out.