Extreme slow navigation from list in UWP for Xamarin.Forms

Hi, I have a Xamarin.Forms app with a main page that contains a list and 2 buttons in the navigation bar.
If in UWP I navigate after an item is clicked it takes 25 seconds to push the new view.
Everything works fine if I navigate after the click of one of the top left buttons.

Am I doing something wrong?

The list page is a ContentPage into a NavigationPage and I display it with Application.Current.MainPage = page after the login.