The Diagnostic Tool can only be used for the Windows version,jbennett411.
For now, we don't have a similar tool for Mac. You can follow these steps to resolve the program's performance issue:
- Update QuickBooks Desktop for Mac
- Make sure that the system you're using is compatible with the Mac version that you have. See this article for more details. System requirements for QuickBooks Desktop for Mac
If you're on a multi-user setup for Mac, follow the recommend steps in this article to help with the performance issue: Troubleshoot multi-user issues for QuickBooks Desktop for Mac
Add another reply below if you need anything else.
