I am new to .NET Maui and I am creating my first application that first checks the dll file for interface implementation, then the user enters a number and the program should output all prime numbers up to it. The problem came up in the visualization, I have the application itself hangs when a large number is processed, so I decided to make it asynchronous. This didn’t help, because the visualization itself hangs when it tries to list these numbers. Then I decided to add gradual scrolling, but it doesn’t work. In the debug this event just doesn’t work.
This is MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:PrimeNumApp"
             x:Class="PrimeNumApp.MainPage">
    
        <VerticalStackLayout
            Padding="30,0"
            Spacing="25">
            <Label
                Text="Cписок простых чисел"
                Style="{StaticResource Headline}"
                SemanticProperties.HeadingLevel="Level1" />
            <Image 
                Source="kitten.gif"
                HeightRequest="200" 
                HorizontalOptions="Center"  
                IsAnimationPlaying="True" />
            <Entry
                x:Name="NumberEntry"
                Placeholder="Введите число" />
            <StackLayout
                Orientation="Horizontal"
                Spacing="5"
                >
                <Button
                    x:Name="LoadBtn"
                    Text="Загрузить сборку" 
                    Clicked="OnLoadClicked"
                    HorizontalOptions="FillAndExpand"
                    BackgroundColor="Gray" />
                <Button
                    x:Name="StartBtn"
                    Text="Посчитать"
                    Clicked="OnStartClicked"
                    IsEnabled="False"
                    HorizontalOptions="FillAndExpand"
                    BackgroundColor="DarkRed" />
            </StackLayout>
            <CollectionView x:Name="PrimeNumCollection"
                            
                            RemainingItemsThreshold="5"
                            RemainingItemsThresholdReached="OnCollectionViewRemainingItemsThresholdReached">
                <CollectionView.ItemsLayout>
                    <LinearItemsLayout Orientation="Vertical" />
                </CollectionView.ItemsLayout>
            <CollectionView.ItemTemplate>
                <DataTemplate>
                    <TextCell Text="{Binding}"
                  TextColor="White"/>
                </DataTemplate>
            </CollectionView.ItemTemplate>
        </CollectionView>
        </VerticalStackLayout>

</ContentPage>

This is MainPage.xaml.cs

using Contract;
using Microsoft.Maui.Controls;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Reflection;
using System.Text;

namespace PrimeNumApp
{
    public partial class MainPage : ContentPage, INotifyPropertyChanged
    {
        private bool _isImplemented;
        private Assembly _assembly;
        private string _realizationPath;
        private IPrimeGenerator _primeNumberGenerator;
        private const int PageSize = 5;
        private int _currentPage = 0;
        public ObservableCollection<int> DisplayablePrimeNums { get; set; }
        private List<int> _allPrimeNumbers = new List<int>();
        public MainPage()
        {
            InitializeComponent();
            DisplayablePrimeNums = new ObservableCollection<int>();
            PrimeNumCollection.ItemsSource = DisplayablePrimeNums;
            PrimeNumCollection.RemainingItemsThresholdReached += OnCollectionViewRemainingItemsThresholdReached;
            

        }
        public async void OnStartClicked(object sender, EventArgs e)
        {
            if (int.TryParse(NumberEntry.Text, out int number))
            {
                try
                {
                    _allPrimeNumbers = await Task.Run(() => _primeNumberGenerator!.GetPrimeNumbers(number));
                    DisplayablePrimeNums.Clear();
                    LoadNextPage();
                    
                }
                catch (Exception ex)
                {
                    await DisplayAlert("Ошибка", ex.Message, "OK");
                }
            }
            else
            {
                await DisplayAlert("Ошибка", "Вы ввели не натуральное число", "OK");
            }
                        
        }
        private void LoadNextPage()
        {
            foreach (int number in _allPrimeNumbers.GetRange(_currentPage, PageSize))
            {
                DisplayablePrimeNums.Add(number);
            }

            _currentPage += PageSize;
        }
        public void OnCollectionViewRemainingItemsThresholdReached(object sender, EventArgs e)
        {
            LoadNextPage();
        }
        public async void OnLoadClicked(object sender, EventArgs e)
        {
            await PickDll();
        }
        private async Task PickDll()
        {
            var customFileType = new FilePickerFileType(
                    new Dictionary<DevicePlatform, IEnumerable<string>>
                    {
                    { DevicePlatform.WinUI, new[] { ".dll" } },
                    });

            try
            {
                var result = await FilePicker.PickAsync(new PickOptions()
                {
                    FileTypes = customFileType,
                    PickerTitle = "Выберите файл формата .dll"
                });

                if (result != null)
                {
                    _realizationPath = result.FullPath;
                    await LoadDll();
                }
            }
            catch (Exception ex)
            {
                await DisplayAlert("Ошибка", "Ошибка при загрузке сборки: " + ex.Message, "OK");
            }
        }
        private async Task LoadDll()
        {
            _assembly = Assembly.LoadFrom(_realizationPath);
            await CheckContractRealization();
        }
        private async Task CheckContractRealization()
        {
            _isImplemented = _assembly.GetTypes().Any(type => type.GetInterfaces().Contains(typeof(IPrimeGenerator)));
            if (_isImplemented)
            {
                LoadBtn.BackgroundColor = Colors.Green;
                StartBtn.IsEnabled = true;
                StartBtn.BackgroundColor = Colors.Gray;
                var primeGeneratorType = _assembly.GetTypes()
                        .Where(type => typeof(IPrimeGenerator).IsAssignableFrom(type) && type.IsClass)
                        .Select(type => type)
                        .First();

                _primeNumberGenerator = (IPrimeGenerator)Activator.CreateInstance(primeGeneratorType)!;
            }
            else
            {
                await DisplayAlert("Ошибка", "Реализация не соответсвует контракту", "OK");
            }
        }

    }

}

I tried changing and removing the scroller itself, displaying DataTemplate inside CollectionView, it didn’t work