WPF TreeGrid - Contrôle Arborescence haute perf

<Window x:Class="SfTreeGridDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:syncfusion="http://schemas.syncfusion.com/wpf"
        xmlns:local="clr-namespace:SfTreeGridDemo"
        mc:Ignorable="d"
        WindowStartupLocation="CenterScreen"
        Title="MainWindow" Height="450" Width="800">
    <Window.DataContext>
        <local:ViewModel />
    </Window.DataContext>
    <Grid x:Name="Root_Grid">
        <syncfusion:SfTreeGrid Name="treeGrid"
                               ChildPropertyName="Children"
                               ItemsSource="{Binding PersonDetails}" />
    </Grid>
</Window>

namespace SfTreeGridDemo
{
    public class ViewModel
    {
        public ViewModel()
        {
            this.PersonDetails = this.CreatePersonData();
        }
        private ObservableCollection<PersonInfo> _personDetails;

        public ObservableCollection<PersonInfo> PersonDetails
        {
            get { return _personDetails; }
            set { _personDetails = value; }
        }

        private ObservableCollection<PersonInfo> CreatePersonData()
        {
            var personList = new ObservableCollection<PersonInfo>();
            ObservableCollection<PersonInfo> childCollection1 = new ObservableCollection<PersonInfo>();
            childCollection1.Add(new PersonInfo() { FirstName = "Andrew", LastName = "Fuller", Availability = true, Salary = 1200000 });
            childCollection1.Add(new PersonInfo() { FirstName = "Theodore", LastName = "Hoover", Availability = true, Salary = 1200000 });
            ObservableCollection<PersonInfo> childCollection2 = new ObservableCollection<PersonInfo>();
            childCollection2.Add(new PersonInfo { FirstName = "Ronald", LastName = "Fillmore", Availability = false, Salary = 23000 });
            childCollection2.Add(new PersonInfo() { FirstName = "Steven", LastName = "Buchanan", Availability = true, Salary = 340000 });
            personList.Add(new PersonInfo() { FirstName = "Obama", LastName = "bosh", Availability = false, Salary = 2000000, Children = childCollection1 });
            personList.Add(new PersonInfo() { FirstName = "John", LastName = "Adams", Availability = true, Salary = 2000000, Children = childCollection2 });
            personList.Add(new PersonInfo() { FirstName = "Thomas", LastName = "Jefferson", Availability = true, Salary = 300000, Children = childCollection1 });
            personList.Add(new PersonInfo() { FirstName = "Andrew", LastName = "Madison", Availability = false, Salary = 4000000, Children = childCollection2 });
            personList.Add(new PersonInfo() { FirstName = "Ulysses", LastName = "Pierce", Availability = true, Salary = 1500000, Children = childCollection1 });

            return personList;
        }
    }
    public class PersonInfo
    {
        private string _firstName;
        private string _lastName;
        private bool _available;
        private double _salary;
        private ObservableCollection<PersonInfo> _children;

        public string FirstName
        {
            get { return _firstName; }
            set { _firstName = value; }
        }

        public string LastName
        {
            get { return _lastName; }
            set { _lastName = value; }
        }

        public bool Availability
        {
            get { return _available; }
            set { _available = value; }
        }

        public double Salary
        {
            get { return _salary; }
            set { _salary = value; }
        }

        public ObservableCollection<PersonInfo> Children
        {
            get { return _children; }
            set { _children = value; }
        }
    }
}