Hi David,
Thank you for using Syncfusion products.
GridGroupingControl has an extremely high performance standard. It can handle very high frequency updates and refresh scenarios. By simply setting few properties, you can have the grid, work with large amounts of data without a performance hit.
You could refer the following page from our online documentation for details:
http://help.syncfusion.com/ug_74/gridwin/Performance1.htmlAlso you could refer the samples under the following category :
{Install drive}:\Documents and Settings\{username}\My Documents\syncfusion\essentialstudio\7.4.0.20\Windows\Grid.Grouping.Windows\Samples\2.0\Performance\Engine Optimization Demo\cs
Please try this and let me know if this helps.
Regards,
Jisha