Performance Excel Export

Hi,

 I have Performance Issues with the Excel spreadprocessing export. To populate a 1000x1000 matrix takes 70 seconds.

Can you please have a look? Thank you!

namespace WpfApplication1
{
    public partial class MainWindow : Window
    {
        private readonly int SIZE = 1000;

        public MainWindow()
        {
            
            InitializeComponent();

            WorkbookFormatProvidersManager.RegisterFormatProvider(new XlsxFormatProvider());
            test();

        }

        public object[,] populateData()
        {
           
            var res = new object[SIZE,SIZE];


            for(int row=0;row<SIZE;row++)
                for(int col=0;col<SIZE;col++)
                    res[row,col] = row+col;

            return res;

        }

        public void test()
        {
            Stopwatch s = Stopwatch.StartNew();
            var sensorDataTable = populateData();
           
            s.Stop();
            Console.WriteLine(string.Format("populate {0} items: {1}ms", SIZE*SIZE, s.ElapsedMilliseconds));

            s = Stopwatch.StartNew();
            Telerik.Windows.Documents.Spreadsheet.Model.Workbook workbook = new Telerik.Windows.Documents.Spreadsheet.Model.Workbook();
            using (new UpdateScope(workbook.SuspendLayoutUpdate, workbook.ResumeLayoutUpdate))
            {
                using (new UpdateScope(
                    () => { workbook.History.IsEnabled = false; },
                    () => { workbook.History.IsEnabled = true; }))
                {
                    workbook.Sheets.Add(SheetType.Worksheet);
                    Telerik.Windows.Documents.Spreadsheet.Model.Worksheet worksheet = workbook.ActiveWorksheet;

                    for(int row=0;row<SIZE;row++)
                        for(int col=0;col<SIZE;col++)
                            worksheet.Cells[row, col].SetValue(sensorDataTable[row, col].ToString());

                    worksheet.Columns[worksheet.UsedCellRange].AutoFitWidth();
                }
            }

            String filename = @"c:\test.xlsx";

            IWorkbookFormatProvider formatProvider = WorkbookFormatProvidersManager.GetProviderByName("XlsxFormatProvider");
            using (var stream = new FileStream(filename, FileMode.CreateNew, FileAccess.ReadWrite))
            {
                formatProvider.Export(workbook, stream);
            }
            s.Stop();
            Console.WriteLine(string.Format("create and save excel: {0}ms", s.ElapsedMilliseconds));
        }

    }
}