When using large lists on large QuickApps installations there can be a decrease in performance
Cause
This was caused by the way QuickApps was pulling information from SharePoint
Resolution
The method used to obtain the data for qListViews has been updated in 6.3 and performance has been improved significantly. If you are experiencing slower response times in qListView web parts, upgrading to 6.3 should be done to gain the new query methods.
Defect ID
This was caused by the way QuickApps was pulling information from SharePoint
