This effect does not relate to the use of UserControl. The effect can occur on high zoom levels when the information layer has a large size, because calculations made to calculate position of object for zooming and panning on high zoom levels are close to the precision of doubles.
The information layer is always geographically limited. If you don't restrict it using the InformationLayer.RegionMode and InformationLayer.Region properties, then it calculates its size dynamically according to location and size of its objects.
I would recommend that you use a few information layers which have its items in smaller regions to avoid this effect.
the Telerik team
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