I uploaded the Sample you have to press first Clear Grid and afterwards import Excel
The you can select items in the Drop Downs.
And enter a value in the Quantity afterwards, for the second entry it becomes very slow.
>Are you trying to use the FormulaCell celltype in a virtual GridControl or a GridDataBoundGrid? If so, are you following the techniques shown in this KB?
http://www.syncfusion.com/support/kb/grid/Default.aspx?ToDo=view&questId=104You will need to cache FormulaTag objects in SaveCellInfo and provide them in QueryCellInfo.
The only other thing that comes to mind that might cause 100% usage might be some kinds of circular references.
Can you reproduce this problem in one of our samples or can you upload a sample with the problem?
CS.zip