我正在使用MAUI开发一个项目，我在shell导航方面遇到了一些问题。在我的代码中有一行：

await Shell.Current.GoToAsync(nameof(DetailMenuPage));

这个代码的执行时间非常长。我有一些业务代码之前，它不需要时间相比导航.此外，我还有其他业务，这是在导航期间执行（在出现事件的命令中），也不需要时间。在导航之前和期间有完整的代码：

public async Task SelectItem(object selectedCategorie)
{
   if (selectedCategorie is CategorieMenu)
   {
      var cSelectedCategorie = selectedCategorie as CategorieMenu;
      var sousCategorie = await _serviceToSousCategorieMenu.GetByCategorieMenuId(new List<int> { cSelectedCategorie.CategorieMenuId });
      StaticContext.CategorieMenuName = cSelectedCategorie.Name;
      StaticContext.SousCategorieMenu = sousCategorie;
      var watch = new System.Diagnostics.Stopwatch();
      watch.Start();
      await Shell.Current.GoToAsync(nameof(DetailMenuPage));
      watch.Stop();
      Console.WriteLine($"Execution Time: {watch.ElapsedMilliseconds} ms");
   }
}

这里watch.ElapsedMilliseconds需要4692 ms。

[RelayCommand]
public async Task Load()
{
   var watch = new System.Diagnostics.Stopwatch();
   watch.Start();
   var allItem = await _serviceMenuItem.GetBySousCategorieMenuId(StaticContext.SousCategorieMenu.Select(sc => sc.SousCategorieMenuId).ToList());
   if (allItem != null && allItem.Count > 0)
   {
      var groupedItem = allItem.GroupBy(u => u.SousCategorieMenuId).Select(grp => grp.ToList()).ToList();
      Title = StaticContext.CategorieMenuName;
      groupedItem.ForEach(c =>
      {
          Items.Add(new CategorieGroup
          (
             StaticContext.SousCategorieMenu.FirstOrDefault(sc => sc.SousCategorieMenuId == c.FirstOrDefault().SousCategorieMenuId).Name,
                    c
          ));
      });
   }
   watch.Stop();
   Console.WriteLine($"Execution Time: {watch.ElapsedMilliseconds} ms");
}

这里watch.ElapsedMilliseconds需要168 ms。
是我错过了什么还是你有什么建议？
编辑：
DetailMenuPage的构造函数：

public DetailMenuPage(DetailMenuPageViewModel vm)
{
    InitializeComponent();
    BindingContext = vm;
}

DetailMenuPage的含量：

<?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"
             x:Class="Byron.Page.DetailMenuPage"
             xmlns:ViewModels="clr-namespace:Byron.ViewModel"
             xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
             x:DataType="ViewModels:DetailMenuPageViewModel"
             xmlns:Models ="clr-namespace:Byron.Model.DTO"
             xmlns:Converter="clr-namespace:Byron.Helper.Converter"
             xmlns:IHM ="clr-namespace:Byron.Model.IHM"
             Routing.Route="DetailPage"
             Title="{Binding Title}">
    <ContentPage.Behaviors>
        <toolkit:EventToCommandBehavior EventName="Appearing" Command="{Binding LoadCommand}" />
    </ContentPage.Behaviors>
    <ContentPage.Resources>
        <Converter:DoubleToStringConverter x:Key="doubleToStringConverter" />
    </ContentPage.Resources>
    
    
    <ScrollView>
        <StackLayout>
            <CollectionView ItemsSource="{Binding Items}" IsGrouped="True" >
                <CollectionView.GroupHeaderTemplate>
                    <DataTemplate x:DataType="IHM:CategorieGroup">
                        <StackLayout HorizontalOptions="FillAndExpand">
                            <Label Text="{Binding GroupTitle}" Style="{StaticResource TitleGroupMenu}"/>
                        </StackLayout>
                    </DataTemplate>
                </CollectionView.GroupHeaderTemplate>
                <CollectionView.ItemTemplate>
                    <DataTemplate x:DataType="Models:MenuItem">
                        <Frame CornerRadius="10" Margin="10" BorderColor="{AppThemeBinding Light=Black, Dark=White}" BackgroundColor="Transparent">
                            <StackLayout Orientation="Vertical" HorizontalOptions="FillAndExpand" VerticalOptions="CenterAndExpand">
                                <StackLayout Orientation="Horizontal">
                                    <Label Text="{Binding Name}" Style="{StaticResource ItemMenu}" />
                                    <Label Text="{Binding Prix, Converter={StaticResource doubleToStringConverter}}" HorizontalOptions="EndAndExpand" Style="{StaticResource ItemMenu}"/>
                                </StackLayout>
                                <Rectangle HeightRequest="1" BackgroundColor="Black" Margin="0,0,100,0" />
                                <Label Text="{Binding Description}" VerticalOptions="Center" TextColor="{AppThemeBinding Light=Black, Dark=White}" />
                            </StackLayout>
                        </Frame>
                    </DataTemplate>
                </CollectionView.ItemTemplate>
            </CollectionView>
        </StackLayout>
    </ScrollView>
</ContentPage>

和视图模型的构造函数：

public DetailMenuPageViewModel(Services.SQLite.Interfaces.IServiceMenuItem serviceMenuItem)
 {
     _serviceMenuItem = serviceMenuItem;
 }