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Created attachment 18746 [details]
Before I'm using ListView, every time I navigate to the exists page or back to the last page It would reset the ListView scroll position, I thought it's a ListView problem, But currently I find out If I put a ScrollViewer and Put a StackLayout in it, also put a lot of viewcontent, and navigate to other page and go back, the ScrollViewer will reset again.
I think that's a kind of source of the performance problem I guess, because every time I switch between exist pages, it will take a few seconds, let user fells just like the App freeze or no response.
Like I mention it it: https://bugzilla.xamarin.com/show_bug.cgi?id=46856
Now I think maybe the page will reset something, a very simple example is the ScrollViewer. Also I found there are some memory leak probmels, Looks like ListView not the only one has memory leak problem.
Only when use Tabbed page, the ScrollViewer will not reset, see detail:
Pull request was closed. Will be revisited.