当处理大容量系统时，由于c#window服务而变得缓慢

下面我粘贴了一个c#代码，我在windows服务中使用线程方法，在服务初始时，在系统上的一些进程变得缓慢后，它正常工作，有时我会收到错误，比如系统超时内存执行之类的错误。

有人能告诉我我的线程方法是否好吗？建议

我正在使用计时器事件，它将每三分钟启动一次-->（DueTime）

（CsvGenFromDatabase）-->这是我在启动方法时调用的方法，它将调用这个中的一些子方法

 protected override void OnStart(string[] args)
    {

            strNowDate = DateTime.Now.ToLongTimeString();
            timerjob.Elapsed += new ElapsedEventHandler(CsvGenFromDatabase);
            timerjob.Interval = Convert.ToDouble(DueTime);
            timerjob.Enabled = true;
            eventLog1.WriteEntry("my service started");
    }

 protected override void OnStop()
    {
            strNowDate = DateTime.Now.ToLongTimeString();
            eventLog1.WriteEntry("my service stopped");
    }
private void CsvGenFromDatabase(object sender, EventArgs e)
    {

            using (TransactionScope scope = new TransactionScope(TransactionScopeOption.RequiresNew)) // Transaction Scope Started
            {
                Thread threadITD = new Thread(new ThreadStart(FileGenerationForITD));  // Thread Initialize for ITD 

                Thread threadCTD = new Thread(new ThreadStart(FileGenerationForCTD));  // Thread Initialize for CTD 

                Thread threadCID = new Thread(new ThreadStart(FileGenerationForCID));  // Thread Initialize for CID 

                Thread threadFFM = new Thread(new ThreadStart(FileGenerationForFFM));  // Thread Initialize for FFM

                try
                {
                    if ((threadITD == null) || (threadITD.ThreadState == System.Threading.ThreadState.Stopped) || (threadITD.ThreadState == System.Threading.ThreadState.Unstarted))
                    {
                        threadITD.Start();  // Thread Started for ITD 
                        //LogError(1, "Form1", "CsvGenFromDatabase", "ITD Thread Started", "ITD Thread Started");
                    }
                    if ((threadCTD == null) || (threadCTD.ThreadState == System.Threading.ThreadState.Stopped) || (threadCTD.ThreadState == System.Threading.ThreadState.Unstarted))
                    {
                        threadCTD.Start(); // Thread Started for CTD 
                       // LogError(1, "Form1", "CsvGenFromDatabase", "CTD Thread Started", "CTD Thread Started");
                    }
                    if ((threadCID == null) || (threadCID.ThreadState == System.Threading.ThreadState.Stopped) || (threadCID.ThreadState == System.Threading.ThreadState.Unstarted))
                    {
                        threadCID.Start(); // Thread Started for CID 
                       // LogError(1, "Form1", "CsvGenFromDatabase", "CID Thread Started", "CID Thread Started");
                    }
                    if ((threadFFM == null) || (threadFFM.ThreadState == System.Threading.ThreadState.Stopped) || (threadFFM.ThreadState == System.Threading.ThreadState.Unstarted))
                    {
                        threadFFM.Start(); // Thread Started for FFM
                        //LogError(1, "Form1", "CsvGenFromDatabase", "FFM Thread Started", "FFM Thread Started");
                    }
                }
                catch (Exception ex)
                {
                    objErrorLog.SrtErrorText = ex.ToString().Substring(0, 25);
                    objErrorLog.StrErrorDescription = ex.ToString();
                    objErrorLog.WriteErrorLog(objErrorLog);
                }
                finally
                {
                    scope.Complete();
                }
            }

    }