CarouselPage too much work in main thread

Hi,
I have create a CarouselPage with a ItemTemplate. The ItemsSource is bind to a ObservableCollection in ViewModel. When I swipe between the pages, in Android I get the message: "The application may be doing too much work on its main thread.". In my ObservableCollection is a another ViewModel to do some logic. Any suggestion, why I get this message and how can I solve it? Thank you.