Thanks I did as you suggested but that didn't seem to help.  

I went to utilities > verify data and was shown the alert: ** verify data detected errors **

So then I went to utilities > rebuild data, after which I was shown another alert:  An error occurred while making your changes

Next, I saw an alert that said Reload and rebuild has completed.

Next, after Quickbooks rebooted it again showed me an alert:  An error occurred while making your changes

And the performance issue persists.  Please help me with what's next @Jovychris_A   Thank you.