Thanks for the project attached. We have tried to reproduce the problem with slow loading application for a couple of seconds during initialization, but unsuccessfully. You may find a sample video attached with what we see on our side.
Could you try to create a sample solution which uses the open street map provider to check a time of initialization on your local environment?
If the initialization using the open street map provider is quick, then the frizzing can be a result of initializing of the Bing Maps imagery service. We use asynchronous request for it, but the code of WCF service client is generated by Visual Studio. So, we can't be sure completely that for example unstable internet connection can be the cause of this problem.
the Telerik team
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