Backend Index Page Issue After Upgrade

After upgrading from 4.2.4 to 4.3.3 the index page of our backend loads extremely slowly and sales do not show. If a date range to display is selected the loading process is slow again but sales will eventually show. So it seems that in addition to slowness to load the dashboard, CS-Cart is not remembering the default date range either. Anyone else experience this?

Thanks for any insights.