Thank you for writing.
The initial delay is caused by the parsing of the styles for the controls that are included the relevant assemblies. For example, when you use RadDataBoundListBox the styles of the controls in the Primitives assembly are parsed and when you use RadCalendar the styles of the controls in the Input assembly are parsed. You can use Jason's approach and add a control to the first page of your application. This way the loading time will be added to the app loading and will be less noticable.
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