Anyone could help me, please.

I wrote a C++ method to find all serial ports, open, write and close and use to Q_INVOKABLE to call this method from a QML.

The problem is a freezing on push LoadingPage.qml if there are many serial ports connected, the animation start and then immediately freezes, when the function find finish, the animation start again. [SerialPort.qml]

How is it the better way to solve that?
Thanks

main.cpp
Qt Code: 
  1. qmlRegisterType<Module::Physical>("MyType", 1, 0, "SerialPort");
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Main.qml
Qt Code: 
  1. ApplicationWindow {
  2.     SerialPort {
  3.         id: module
  4.     }
  5. }
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SerialPort.qml
Qt Code: 
  1. Button {
  2.     text: qsTr("start")
  3.     onClicked: {
  4.         stackView.push(Qt.resolvedUrl("LoadingPage.qml"))
  5.         module.find()
  6.     }
  7. }
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serialport.h
Qt Code: 
  1. Q_INVOKABLE QVector<QString> find();
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serialport.cpp
Qt Code: 
  1. QVector<QString> Physical::find()
  2. {
  3.     m_ports.clear();
  4.  
  5.     foreach (const QSerialPortInfo &info, QSerialPortInfo::availablePorts()) {
  6.         bool hasError = false;
  7.  
  8.         QSerialPort port;
  9.         port.setPort(info);
  10.  
  11.         if (port.open(QIODevice::ReadWrite)) {
  12.             if (!hasError && !port.setBaudRate(serial::baudRate)) {
  13.                 emit error(tr("Can't set baud to %1, error %2")
  14.                            .arg(port.portName())
  15.                            .arg(port.error()));
  16.                 hasError |= true;
  17.             }
  18.             if (!hasError && !port.setDataBits(serial::dataBits)) {
  19.                 emit error(tr("Can't set data bits to %1, error %2")
  20.                            .arg(port.portName())
  21.                            .arg(port.error()));
  22.                 hasError |= true;
  23.             }
  24.  
  25.             if (!hasError && !port.setParity(serial::parity)) {
  26.                 emit error(tr("Can't set parity to %1, error %2")
  27.                            .arg(port.portName())
  28.                            .arg(port.error()));
  29.                 hasError |= true;
  30.             }
  31.             if (!hasError && !port.setStopBits(serial::stopBits)) {
  32.                 emit error(tr("Can't set stop bits to %1, error %2")
  33.                            .arg(port.portName())
  34.                            .arg(port.error()));
  35.                 hasError |= true;
  36.             }
  37.             if (!hasError && !port.setFlowControl(serial::flowCtrl)) {
  38.                 emit error(tr("Can't set flow control to %1, error %2")
  39.                            .arg(port.portName())
  40.                            .arg(port.error()));
  41.                 hasError |= true;
  42.             }
  43.             if (!hasError) {
  44.                 m_ports.append(port.portName());
  45.             }
  46.  
  47.             QByteArray data;
  48.             data.resize(1);
  49.             data[0] = ID_READ;
  50.  
  51.             port.write(data);
  52.             port.close();
  53.         }
  54.     }
  55.  
  56.     return m_ports;
  57. }
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