A common pitfall I see in Xamarin Forms is adding a Loading page icon for every page. This is one of the problems that plagued the current Home Control Flex application. Instead of having to loading icon on each page you can crate a base page that has a loading screen on each. You can do this using the ContentPropertyAttribute on your base page as shown below.
Creating a Common Loading Page for Xamarin Forms
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wow! this is great article. I never knew I could do this! Thanks.