Hi Ruslan,
Here is a forum thread discussing this and it had a sample showing QueryCellInfo only being hit once.
http://www.syncfusion.com/support/forums/grid-windows/24997You might also see the SingleQueryCellInfo technique from our sample "OTO Query Cell Info Demo" where QueryCellInfo is only hit once.
C:\Documents and Settings\[Username]\My Documents\syncfusion\essentialstudio\7.4.0.20\Windows\Grid.Windows\Samples\2.0\Performance\OTO Query Cell Info Demo\cs
Please let me know if you have any further queries.
Regards,
Jisha