dispatcher performance

gistfile1.cs

        private Stopwatch _stopwatch = new Stopwatch();

        private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
        {
            ThreadPool.QueueUserWorkItem(_ =>
                {
                    _stopwatch.Start();
                    Dispatcher.Invoke(() =>
                        {
                            _stopwatch.Stop();
                            MessageBox.Show("elapsed: " + _stopwatch.ElapsedTicks);
                        });
                });
        }