1:- Close the company file before exiting QuickBooks and reduce to a minimum the amount of window that does open once you open our company file.
2:- Verified backup, Perform a manual.
3:- Reduce your DB file fragments if they ‘re too high.
4:- Clear the queues for forms to be printed.
5:- Run the cleanup utility to reduces your company file is overall size.
6:- Avoid excessive use of sub accounts, subitems, and jobs, which are effectively sub -customers.
7:- Stop using Google QuickBooks Desktop.
8:- Consider an upgrade to Enterprise Solutions.
9:- Investigate network issues if QuickBooks is installed on a network.
If you want to more information then Contact QuickBooks Support phone number +1-855-441-4417.