Qt slow when reading from serialPort

[Massaimara98]

whenever i do , my qt code always get slow compared c#. I dont expect any performance between c# and qt framework but at least dont late read from serialport.
here two example , one of them writting at C# and the other is Qt.
c# code (this code isnt belong to me)

byte[] pkg2 = new byte[3]; // just console output
           while ((1 == 1) && (Buffer.Count > 0))
           {
               // packet header available and one packet available
               while ((Buffer.Count > 0) && (Buffer[0] != 0xa5)) Buffer.RemoveAt(0);

               Debug.WriteLine(Buffer.Count); // // just console output
               if ((Buffer.Count >= 17) && (Buffer[0] == 0xa5))
               {
                   pkg2[0] = Buffer[0];

                   // read packet
                   byte[] pkg = new byte[17];
                   Olimexino328_packet pk = new Olimexino328_packet();

                   for (int i = 0; i < 17; i++) {
                       pkg[i] = Buffer[0];
                       Buffer.RemoveAt(0);
                   }

                   if ((pkg[0] == 0xa5) && (pkg[1] == 0x5a))
                   {
                       pk.sync0 = pkg[0];
                       pk.sync1 = pkg[1];
                       pk.version = pkg[2];
                       pk.count = pkg[3];
                       pk.d1 = (UInt16)(pkg[5] + (pkg[4] << 8));
                       pk.d2 = (UInt16)(pkg[7] + (pkg[6] << 8));
                       pk.d3 = (UInt16)(pkg[9] + (pkg[8] << 8));
                       pk.d4 = (UInt16)(pkg[11] + (pkg[10] << 8));
                       pk.d5 = (UInt16)(pkg[13] + (pkg[12] << 8));
                       pk.d6 = (UInt16)(pkg[15] + (pkg[14] << 8));
                       //Debug.WriteLine(pk.d1);
    
                       pk.switches = pkg[16];

                       rtfv1.Pop(pk.d1);
                       rtfv2.Pop(pk.d2);
                       rtfv3.Pop(pk.d3);
                       rtfv4.Pop(pk.d4);
                       rtfv5.Pop(pk.d5);
                       rtfv6.Pop(pk.d6);
                   }
                   else
                   {
                       Debug.WriteLine("Invalid packet received!");
                   }
               }
               else
               {
                   break;
               }

           }

and its my Qt Code

void myRecord::readData()
{
    int const_a5=165;
    int const_5a=90;
    Buffer.append(serialPort->readAll());
    while ((Buffer.size()> 0) && (Buffer.at(0) != char(const_a5)))
    {
        Buffer.remove(0,1);

    }
    qDebug() << Buffer.size();
    if ((Buffer.size() >= 17) && (Buffer.at(0) == char(const_a5)))
{

        char pkg[17];
        Olimexino328_packet pk ;

        for (int i = 0; i < 17; i++) {
            pkg[i] = Buffer.at(0);
            Buffer.remove(0,1);
        }
        if ((pkg[0] == (char)const_a5) && (pkg[1] == (char)const_5a))
        {
            pk.sync0 = pkg[0];
            pk.sync1 = pkg[1];
            pk.version = pkg[2];
            pk.count = pkg[3];
            pk.d1 = (quint16)(pkg[5] + (pkg[4] << 8));
            pk.d2 = (quint16)(pkg[7] + (pkg[6] << 8));
            pk.d3 = (quint16)(pkg[9] + (pkg[8] << 8));
            pk.d4 = (quint16)(pkg[11] + (pkg[10] << 8));
            pk.d5 = (quint16)(pkg[13] + (pkg[12] << 8));
            pk.d6 = (quint16)(pkg[15] + (pkg[14] << 8));

            pk.switches = pkg[16];

            emit incomingData(pk.d1);

                              }
          }
    }

ofc this (myRecord::readData) connect to signal readyRead().
There are two code just trying to read from arduino and arduino sending just 17 byte.
but how did i understood my Qt code is slow ? From output...
when i seeking Buffer.size() , at Qt , size increasing without any stopping , just Qt does not keep up to remove, on the other hand at c#, number sometimes get bigger sometimes thinner but i can understand at least c# keep up to remove data

Anyway, maybe my code isnt just good as i think, maybe tell me someone say what's wrong with my code ?
Thank you...

------UPDATED-------
i finally find my solution for problem.
Solution is , everybody says there is common mistake do something in readyRead() so i created new method and send data to it.
like that :

void myRecord::readData()
{
if (serialPort->isReadable())
processData(serialPort->readAll());

}
void myRecord::processData(QByteArray &Buffer)
{
int const_a5=165;
int const_5a=90;
while ((Buffer.size()> 0) && (Buffer.at(0) != char(const_a5)))
{
Buffer.remove(0,1);

}
if ((Buffer.size() >= 17) && (Buffer.at(0) == char(const_a5)))

{

    char pkg[17];
    Olimexino328_packet pk ;

    for (int i = 0; i < 17; i++) {
        pkg[i] = Buffer.at(0);
        Buffer.remove(0,1);
    }
    if ((pkg[0] == (char)const_a5) && (pkg[1] == (char)const_5a))
    {
        pk.sync0 = pkg[0];
        pk.sync1 = pkg[1];
        pk.version = pkg[2];
        pk.count = pkg[3];
        pk.d1 = (quint16)(pkg[5] + (pkg[4] << 8));
        pk.d2 = (quint16)(pkg[7] + (pkg[6] << 8));
        pk.d3 = (quint16)(pkg[9] + (pkg[8] << 8));
        pk.d4 = (quint16)(pkg[11] + (pkg[10] << 8));
        pk.d5 = (quint16)(pkg[13] + (pkg[12] << 8));
        pk.d6 = (quint16)(pkg[15] + (pkg[14] << 8));

        pk.switches = pkg[16];
        if (pk.d1 < 60000)
        emit incomingData(pk.d1);

      }
  }

    }

So that's it ..

[IPlayGenji6]

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