QuickBooks Desktop Performance Issues

Backup creation aids in improving the performance as it resets the Transaction Log File(*.TLG) which is used to track the changes made in the company data files before it is saved in the database. To create a backup, follow the mentioned steps:
Select File Backup Company Create Local Backup

Click on Local Backup Options
From the given options under the heading “Tell us where to save your back up copies”, choose “Desktop”
Select “Complete Verification” and select OK
Click “Save it Now” and then hit OK
From the “Save Backup Copy” window, select Desktop and click on Save button
Once you hit the Save button, QuickBooks will start creating backup files

You can trial run QuickBooks in a multi-user surrounding to ensure if the network or the company data file is causing the issues. You can test the performance of your Network by following the steps mentioned below:

Open your QuickBooks application and hit F2 key
Select your Company under File Location
Log out all the users from QuickBooks and close the application
Select Start a Computer a Company File
Right click on the QBW(Company File) and select Copy and paste it anywhere on your Desktop
Next, test the performance your network while the file is local by running Disk Defragmentation.

Performance Issues affecting only a bunch of few employees
Performance Issues affecting the entire organization
Your files take time to open
When working in a multi-user environment, file execution takes longer due to
increased number of users signing in
As the day progresses, the processing speed of the files goes slow
Performance Issues occur at irregular intervals, sometimes the files run smoothly and sometimes they execute very slow
Performance Issues due to faulty Network Condition, which damages your data files.
Whenever you use QuickBooks, the size of your Data Files grows. As the data file size grows more and more, you need more and more resources to make them functional. It might happen