渲染期间WPF DataGrid加载缓慢

我有一个几乎有8000行的WPF数据网格。加载大约需要25秒。我该如何提高它的性能？

此网格有3个静态ButtonType列，其他列为动态列。我获取列表中的数据，并将其分配给CodeBehind上DataGrid的ItemsSource属性。

这是XAML代码：

<UserControl x:Class="TransportApp.Views.CommonScreen.SideBar.DetailsGrid"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:mui="http://firstfloorsoftware.com/ModernUI"
             xmlns:sys="clr-namespace:System;assembly=mscorlib"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid Margin="5,0,0,0" VirtualizingStackPanel.IsVirtualizing="True">
        <Grid.RowDefinitions>
            <RowDefinition Height="60"/>
            <RowDefinition Height="1*"/>
            <RowDefinition Height="5" />
        </Grid.RowDefinitions>
        <Grid Grid.Row="0"  HorizontalAlignment="Left">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="1*"/>
                <ColumnDefinition Width="120"/>
                <ColumnDefinition Width="30"/>
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition Height="30"/>
                <RowDefinition Height="30"/>
            </Grid.RowDefinitions>
            <Label Name="DisplayHeader" Grid.Row="0" Content="Information" VerticalAlignment="Center" FontSize="20" />
            <DatePicker Name="dtGridFilterDate" Grid.Column="1" Grid.Row="0" Margin="4" SelectedDate="{x:Static sys:DateTime.Now}"/>
            <mui:ModernButton Name="Cmd_Refresh" Grid.Column="2" Grid.Row="0" ToolTip="Click to Refresh View" IconData="{StaticResource RefreshIconData}" EllipseStrokeThickness="2" EllipseDiameter="26" IconHeight="15" IconWidth="15" Click="Cmd_Refresh_Click"/>
            <DockPanel Grid.Column="0" Grid.ColumnSpan="2" Grid.Row="1">
                <Label FontWeight="Bold" DockPanel.Dock="Left" Name="lblFilter" Content="Filter" VerticalAlignment="Center"/>
                <TextBox DockPanel.Dock="Right" Margin="4" HorizontalAlignment="Stretch" Grid.Column="1" VerticalContentAlignment="Center" Name="filterBox1"/>
            </DockPanel>
            <mui:ModernButton Name="cmdSearch" Grid.Column="2" Grid.Row="1" ToolTip="Click to Search" IconData="{StaticResource SearchData}" EllipseStrokeThickness="2" EllipseDiameter="26" IconHeight="11" IconWidth="11" Click="cmdSearch_Click"/>
        </Grid>
        <DataGrid Name="DG_Details" Grid.Row="1" 
                      AutoGenerateColumns="True" IsReadOnly="True" 
                      CanUserAddRows="False" CanUserDeleteRows="False" 
                      SelectionMode="Single" EnableRowVirtualization="True"
                      VirtualizingStackPanel.IsVirtualizing="True"
                      AutoGeneratingColumn="DG_Details_AutoGeneratingColumn" 
                      HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Disabled">
            <DataGrid.Columns>
                <DataGridTemplateColumn x:Name="dgEditColumn">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <mui:ModernButton Name="Cmd_Edit" Click="Cmd_Edit_Click" ToolTip="Edit" IconData="{StaticResource EditIconData}" EllipseStrokeThickness="2" EllipseDiameter="20" IconHeight="10" IconWidth="10"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTemplateColumn x:Name="dgDeleteColumn">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <mui:ModernButton Name="Cmd_Delete" Click="Cmd_Delete_Click" ToolTip="Delete" IconData="{StaticResource DeleteIconData}" EllipseStrokeThickness="2" EllipseDiameter="20" IconHeight="10" IconWidth="10"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTemplateColumn x:Name="dgPrintColumn" Visibility="Hidden">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <mui:ModernButton Name="Cmd_Print" Click="Cmd_Print_Click" ToolTip="Re-Print document" IconData="{StaticResource PrintIconData}" EllipseStrokeThickness="2" EllipseDiameter="20" IconHeight="10" IconWidth="10"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</UserControl>

数据加载逻辑

var customerList = (from c in context.Customers
                                            where c.IsDeleted == false
                                            select new
                                            {
                                                FirstName = c.FirstName,
                                                LastName = c.LastName,
                                                Phone = c.Phone,
                                                CustomerId = c.CustomerId
                                            }).ToList();
                            DG_Details.ItemsSource = customerList;
                            DG_Details.Items.Refresh();

这里需要注意的一点是，加载后DataGrid的性能非常好。一点也不滞后。我使用的是一台带有4GB RAM和512MB显卡的酷睿i5机器。

请告诉我是否可以在此代码中进行任何优化。