Sqlite批量插入在部署到客户端计算机后变得更慢

Question

我有一个C＃windows应用程序，有时应用程序将用于从excel文件导入记录，我可以在我的开发机器上使用批量插入在一分钟内导入2500条记录，当我尝试正常的常规插入方法时，它也花了插入2500条记录的同一分钟，在我部署应用程序并安装在客户端的机器上后，这变得更糟，导入相同数量的记录需要两个多小时，我感觉因为我正在使用批量插入，速度应该大大优化，下面是我的代码：

 public int InsertTaxRecordBatchTransaction(IEnumerable<EmployeeDetails> employeeDetails)
    {
        SQLiteConnection conn = null;
        SQLiteCommand cmd = null;
        var results = new List<int>();

        try
        {              
            string insert = "INSERT INTO IncomeTax (OrganisationId,OrganisationName,StaffId,StaffName,Department,Position,NoOfMonthsWorked,TaxIdNumber,SessionId,Month,Year,BasicSalaryVALUES (@OrganisationId,@OrganisationName,@StaffId,@StaffName,@Department,@Position,@NoOfMonthsWorked,@TaxIdNumber,@SessionId,@Month,@Year,@BasicSalary);";
            using (conn = new SQLiteConnection(connstring))
            {
                conn.Open();
                using (var transaction = conn.BeginTransaction())
                {
                    try
                    {
                        using (cmd = conn.CreateCommand())
                        {
                            //cmd = new SQLiteCommand(insert, conn);
                            cmd.CommandType = CommandType.Text;
                            cmd.CommandText = insert;
                            cmd.CommandTimeout = 900000000;
                            cmd.Parameters.Add("@OrganisationId", DbType.String, 50).Value = OrganisationId;
                            cmd.Parameters.Add("@OrganisationName", DbType.String, 50).Value = OrganisationName;
                            cmd.Parameters.Add("@StaffID", DbType.String, 50).Value = StaffId;
                            cmd.Parameters.Add("@StaffName", DbType.String, 50).Value = StaffName;
                            cmd.Parameters.Add("@Department", DbType.String, 50).Value = Department;
                            cmd.Parameters.Add("@Position", DbType.String, 50).Value = Position;
                            cmd.Parameters.Add("@NoOfMonthsWorked", DbType.Int16, 5).Value = NoOfMonthsWorked;
                            cmd.Parameters.Add("@TaxIdNumber", DbType.String, 5).Value = TaxIdNumber;
                            cmd.Parameters.Add("@SessionId", DbType.String, 20).Value = SessionId;
                            cmd.Parameters.Add("@Month", DbType.String, 20).Value = Month;
                            cmd.Parameters.Add("@Year", DbType.String, 20).Value = Year;
                            cmd.Parameters.Add("@BasicSalary", DbType.Decimal, 2).Value = BasicSalary;

                            foreach (var employee in employeeDetails)
                            {
                                cmd.Parameters.Add("@OrganisationId", DbType.String, 50).Value = employee.OrganisationId;
                                cmd.Parameters.Add("@OrganisationName", DbType.String, 50).Value = employee.OrganisationName;
                                cmd.Parameters.Add("@StaffID", DbType.String, 50).Value = employee.StaffId;
                                cmd.Parameters.Add("@StaffName", DbType.String, 50).Value = employee.StaffName;
                                cmd.Parameters.Add("@Department", DbType.String, 50).Value = employee.Department;
                                cmd.Parameters.Add("@Position", DbType.String, 50).Value = employee.Position;
                                cmd.Parameters.Add("@NoOfMonthsWorked", DbType.Int16, 5).Value = employee.NoOfMonthsWorked;
                                cmd.Parameters.Add("@TaxIdNumber", DbType.String, 5).Value = employee.TaxIdNumber;
                                cmd.Parameters.Add("@SessionId", DbType.String, 20).Value = employee.SessionId;
                                cmd.Parameters.Add("@Month", DbType.String, 20).Value = employee.Month;
                                cmd.Parameters.Add("@Year", DbType.String, 20).Value = employee.Year;
                                cmd.Parameters.Add("@BasicSalary", DbType.Decimal, 2).Value = employee.BasicSalary;

                                results.Add(cmd.ExecuteNonQuery());
                            }

                        }
                        transaction.Commit();
                        DspMsg = "Tax computed successfully!";
                    }
                    catch(Exception ex)
                    {
                        transaction.Rollback();
                        DspMsg = ex.Message+ " some errors have occured, no record was saved! ";
                    }
                }
            }
           // conn.Close();
        }
        catch (SQLiteException ex)
        {

            DspMsg = ex.Message;
        }
        return results.Sum();
    }

我不知道我哪里弄错了，我将不胜感激。