Why is Quickbooks Desktop very slow accessing data files since last update

After I updated QBs over a week ago, it takes almost 10 minutes or more to open files that are on my server.  There are other computers that I have not run the update (thank goodness) that open just fine with minimal lag time.  I have tried to uninstall and reinstall, change mapping, restart server, called Support and am listed in an “Investigation” with others having the same issue.  Anyone else having this problem or found a fix to it?  I’ve run update almost every day and there are critical fixes that are updated but so far none that have fixed this.