C# 串口接收数据为什么特别慢,该怎么处理

C# 串口接收数据为什么特别慢
本人自己C#写的一个串口程序，本来想用它来实时显示波形的，但是串口接收数据的时候太慢了。程序是在串口收到数据时候richtext上输出字符，115200的波特率发现每秒钟只能输出十几个“er”字符。但是用网上下的一个串口调试器，每秒钟能输出上百个字符。这是什么原因？底层的问题么？

C# code


namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {

        int pix_index;
        bool recived=false;
        int[] buff = new int[13];
        int sw=1;
        int index = 0;
        List<float> AccX = new List<float>();
        List<float> AccY = new List<float>();
        List<float> AccZ = new List<float>();
        List<float> GyroX = new List<float>();
        List<float> GyroY = new List<float>();
        List<float> GyroZ = new List<float>();
        List<float> X = new List<float>();
        public Form1()
        {
            System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;
            InitializeComponent();
            string[] port = null;
            try
            {
                port = SerialPort.GetPortNames();

            }
            catch (Exception ex)
            {
                throw new Exception("获取计算机COM口列表失败!\r\n错误信息:" + ex.Message);
            }

            comboBox1.Items.AddRange(port);
            
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (button1.Text == "连接")
            {
                serialPort1.PortName = (string)comboBox1.SelectedItem;
                try
                {
                    serialPort1.Open();
                }
                catch (Exception ex)
                {
                    MessageBox.Show("打开出错");
                }
            }
            else
            {
                button1.Text = "连接";
                serialPort1.Close();
            }

            if (serialPort1.IsOpen)
            {
                button1.Text = "已连接";
                zGraph1.f_ClearAllPix();
                zGraph1.f_reXY();
                zGraph1.f_LoadOnePix(ref X, ref GyroX, Color.Red, 2);//增加一条曲线
                zGraph1.f_AddPix(ref X, ref GyroY,Color.Blue,2);
                zGraph1.f_AddPix(ref X, ref GyroZ, Color.Yellow, 2);
                zGraph1.f_AddPix(ref X, ref AccX, Color.Green, 2);
                zGraph1.f_AddPix(ref X, ref AccY, Color.White, 2);
                zGraph1.f_AddPix(ref X, ref AccZ, Color.Lime, 2);

            }
        }

        private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            int tmp;
            //tmp = serialPort1.ReadByte();
            richTextBox1.AppendText("er ");
            
            //switch(sw)
            //{
            //    case 1 :
            //        if (tmp == 0x3f)
            //            sw=2;
            //        break;
            //    case 2:
            //        if (tmp == 0xee)
            //            sw = 3;
            //        else
            //            sw = 1;
            //        break;
            //    case 3:
            //        buff[index] = tmp;
                   
            //        index++;
            //        if (index == 12)
            //        {
            //            index = 0;
            //            sw = 1;
                      
            //            recived = true;
            //        }
            //        break;
            //}

          //  if (recived)
          //  {
          //      X.Add(pix_index++);//X轴增加
          //      recived = false;
          //      GyroX.Add((short)(buff[0] << 8) + buff[1]);
          //      GyroY.Add((short)(buff[2] << 8) + buff[3]);
          //      GyroZ.Add((short)(buff[4] << 8) + buff[5]);
          //      AccX.Add((short)(buff[6] << 8) + buff[7]);
          //      AccY.Add((short)(buff[8] << 8) + buff[9]);
          //      AccZ.Add((short)(buff[10] << 8) + buff[11]);
          //      zGraph1.Refresh();//刷新显示

          //      richTextBox1.Text += (short)((buff[0] << 8) + buff[1]);
          //      richTextBox1.Text += " ";
          //      richTextBox1.Text += (short)((buff[2] << 8) + buff[3]);
          //      richTextBox1.Text += " ";
          //      richTextBox1.Text += (short)((buff[4] << 8) + buff[5]);
          //      richTextBox1.Text += " ";
          //      richTextBox1.Text += (short)((buff[6] << 8) + buff[7]);
          //      richTextBox1.Text += " ";
          //      richTextBox1.Text += (short)((buff[8] << 8) + buff[9]);
          //      richTextBox1.Text += " ";
          //      richTextBox1.Text += (short)((buff[10] << 8) + buff[11]);
          //      richTextBox1.Text += " ";
          ////      richTextBox1.Text += buff[12];
          //     // richTextBox1.Text += "\r\n";
          //      richTextBox1.AppendText("\r\n");
          //      richTextBox1.ScrollToCaret();
          //  }
            
            
           
        }

        private void button2_Click(object sender, EventArgs e)
        {
            zGraph1.f_ClearAllPix();//清除所有
        }


    }
}

C# 串口接收数据为什么特别慢,该怎么处理

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