testing list page perf

src/App/App.csproj

@@ -82,6 +82,7 @@
     <Compile Include="Pages\LoginNavigationPage.cs" />
     <Compile Include="Pages\MainPage.cs" />
     <Compile Include="Pages\SettingsEditFolderPage.cs" />
+    <Compile Include="Pages\TestListPage.cs" />
     <Compile Include="Pages\SyncPage.cs" />
     <Compile Include="Pages\SettingsPage.cs" />
     <Compile Include="Pages\SettingsListFoldersPage.cs" />

src/App/Pages/SettingsPage.cs

@@ -126,7 +126,7 @@ namespace Bit.App.Pages
 
         private void TouchIdCell_Tapped(object sender, EventArgs e)
         {
-
+            Navigation.PushAsync(new TestListPage());
         }
 
         private void FoldersCell_Tapped(object sender, EventArgs e)

src/App/Pages/TestListPage.cs

@@ -0,0 +1,68 @@
+using System;
+using Xamarin.Forms;
+using Bit.App.Utilities;
+using System.Collections.Generic;
+
+namespace Bit.App.Pages
+{
+    public class TestListPage : ContentPage
+    {
+        public TestListPage()
+        {
+            var textCell = new TextCell();
+            textCell.SetBinding<Bar>(TextCell.TextProperty, s => s.BarName);
+
+            var listView = new ListView
+            {
+                IsGroupingEnabled = true,
+                GroupDisplayBinding = new Binding("FooName"),
+                ItemsSource = Items,
+                ItemTemplate = new DataTemplate(() => textCell),
+                HasUnevenRows = true,
+                SeparatorColor = Color.FromHex("d2d6de")
+            };
+
+            Content = listView;
+        }
+
+        public ExtendedObservableCollection<Foo> Items { get; private set; } = new ExtendedObservableCollection<Foo>();
+
+        protected override void OnAppearing()
+        {
+            base.OnAppearing();
+
+            var foos = new List<Foo>();
+            foos.Add(new Foo("Foo 1", MakeBars()));
+            foos.Add(new Foo("Foo 2", MakeBars()));
+            foos.Add(new Foo("Foo 3", MakeBars()));
+            foos.Add(new Foo("Foo 4", MakeBars()));
+            Items.Reset(foos);
+        }
+
+        private IEnumerable<Bar> MakeBars()
+        {
+            var numbers = new List<Bar>();
+            for(int i = 0; i < 100; i++)
+            {
+                numbers.Add(new Bar { BarName = i.ToString() });
+            }
+            return numbers;
+        }
+
+        public class Foo : List<Bar>
+        {
+            public Foo(string name, IEnumerable<Bar> bars)
+            {
+                FooName = name;
+                AddRange(bars);
+            }
+
+            public string FooName { get; set; }
+        }
+
+        public class Bar
+        {
+            public string BarName { get; set; }
+        }
+    }
+}