Hello Subarna Bandyopadhya,
Have you tried to use the Virtualization of the RadTileView? In its concept the virtualization works like this - you have to set some RowHeight and/or ColumnWidth to the RadTileView (so that not all items are inside the viewable area), turn it on by setting the IsVirtualizing property to True and then when you start your application the RadTileView will generate only the items that are visible.
For further references could you please examine the attached project (to see the difference just set the IsVirtualizing to false) and if you have more questions feel free to ask.
the Telerik team
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