Hi Sathish,
We appreciate your interest in upgrading our product.
In our Latest Primary Release v4.4.0.51, the GridGroupingControl source has been re-written to maximize the performance. For details, refer to the following release notes.
http://www2.syncfusion.com/Installs/v4.4.0.51/release_notes/ReleaseNotes.htm Best regards,
Haneef