Xamarin.Forms performance(One MainActivity 80+ ContentPages)

Hi all,

I use xamarin.forms builded an APP, the APP only have one MainActivity class and has more than 80 ContentPages, every ContentPage atleast has one 'Back' button to go to previous page and every page has a override method >>>>protected override bool OnBackButtonPressed() {return true}

When i do testing for about 2 hours, the APP seems run slowly and slowly...

For example, when i done the process in page D, when i press the "Back' button go to C page, do we do some such as clean MEMORY on page D?(if yes, can give me some example code to reference?) or other process to Kill page D?

Can the MainActivity to be restart by some coding without exist the APP? or someone give me some other solutions, many thanks...

I don't have Native Android development experience，i'm a .neter(C#)