Populate a GridView with data binding only once per execution

I am currently making a UWP app with XAML and C#, but I hit a major issue. The home page contains 700+ items, all stored in a SQLite database and populated at runtime. Each time I navigate out and return to the page, the app freezes for a while and then displays the home page... How can I populate it only once, even if it is taking all my startup time?