speed performance exporting to excel file using Microsoft.Office.Interop.Excel

I am using Microsoft.Office.Interop.Excel to export local database table to excel file. There are five columns.

If rows are 400 it takes about 20 seconds,

If rows are 1200 it takes about 45 seconds,

If rows are 5000 it takes 250-300 seconds.

Is there a way to minimize the time to export? Or this is the maximum performance? If you can suggest to improve my code with respect to speed or suggest some alternative, I will appreciate. As it is working in background worker therefore invoking was necessary. My code is

       int rowCount = oLXTableDataGridView.RowCount;

        if (rowCount == 1)
        {
            MessageBox.Show("No data to export.");

            return;

        }

        this.Invoke((MethodInvoker)delegate
                {
                     this.ExportFilepictureBox.Image = Properties.Resources.Animation;
                     labelexpoertolx.Text = "Preparing to export...";
                });


                object misValue = System.Reflection.Missing.Value;


                conn = new SqlCeConnection(@"Data Source=|DataDirectory|\dontdelete.sdf");
                String selectgroup = "SELECT * FROM OLXTable";
                int namecol = 1;
                int cellcol = 2;
                int emailcol = 3;
                int citycol = 4;
                int categorycol = 5;


                    try
                    {

                        Excel.Application xlApp1;
                        Excel.Workbook xlWorkBook;
                        Excel.Worksheet xlWorkSheet;


                        xlApp1 = new Excel.Application();
                        xlWorkBook = xlApp1.Workbooks.Add(misValue);


                        xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
                        // MessageBox.Show("this is file");


                        xlWorkSheet.Cells[1, namecol].Value2 = "Name";
                        xlWorkSheet.Cells[1, cellcol].Value2 = "Cell No";
                        xlWorkSheet.Cells[1, emailcol].Value2 = "Email";
                        xlWorkSheet.Cells[1, citycol].Value2 = "City";
                        xlWorkSheet.Cells[1, categorycol].Value2 = "Category";

                        SqlCeDataReader reader = null;


                        //conn = new SqlCeConnection(selectnumbers);
                        conn.Open(); //open the connection
                        SqlCeCommand selecectnumberscmd = new SqlCeCommand(selectgroup, conn);
                        reader = selecectnumberscmd.ExecuteReader();
                        int i =  1;

                        while (reader.Read())
                        {
                            xlWorkSheet.Cells[i, namecol].Value2 = reader.GetString(1);
                            xlWorkSheet.Cells[i, cellcol].Value2 = reader.GetInt64(2);
                            xlWorkSheet.Cells[i, emailcol].Value2 = reader.GetString(3); ;
                            xlWorkSheet.Cells[i, citycol].Value2 = reader.GetString(4);
                            xlWorkSheet.Cells[i, categorycol].Value2 = reader.GetString(5);
                            i++;

                        }
                        conn.Close();
                        xlWorkBook.Close(true, misValue, misValue);
                        xlApp1.Quit();
                        releaseObject(xlWorkSheet);
                        releaseObject(xlWorkBook);
                        releaseObject(xlApp1);



                        this.Invoke((MethodInvoker)delegate
                        {
                            this.ExportFilepictureBox.Image = null;
                            labelexpoertolx.Text = "";
                        });


                    }
                    catch (Exception e13)
                    {
                        MessageBox.Show("Error Exporting data" + e13.Message);
                        conn.Close();


                    }
                    Cursor.Current = Cursors.Default;

and

private void releaseObject(object obj)
    {
        try
        {
            System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
            obj = null;
        }
        catch (Exception ex)
        {
            obj = null;
            MessageBox.Show("Exception Occured while releasing object " + ex.ToString());
        }
        finally
        {
            GC.Collect();
        }
    }