Hi Anand,
If you load big data sets in TreeGrid or DataTable, you should enable Paging due to the fact that the widget creates all UI Elements for your Data and if Paging is Enabled, it would create the UI Elements for the Current Page only. So if you have 150 rows and 30 columns and you did not enable paging, you will have 4500 HTML Elements for the Cells which will slow down your app. If you enable Paging, you will have only 300 HTML Elements for cells which will work much better.
Best Regards,
Peter Stoev
jQWidgets Team
http://www.jqwidgets.com