Append text Gui freezed

[Alshathry]

Hi there ,append text from python to qml textarea freezing Gui , please how to fix that

    import QtQuick 2.15
    import QtQuick.Window 2.15
    import QtQuick.Controls 2.15
    Window {
        width: 640
        height: 480
        visible: true
        title: qsTr("Hello World")
        Flickable  {
            id: scrollView
            x: 13
            y: 38
            width: 647
            height: 168
            contentWidth: text1.width; contentHeight: text1.height
            visible: true
            flickableDirection: Flickable.VerticalFlick
            clip: true
            ScrollBar.vertical: ScrollBar{}
            ScrollBar.horizontal: ScrollBar{}
            TextArea {
                id: text1
                opacity: 1
                visible: true
                color: "#000000"
                font.pixelSize: 16
                verticalAlignment: Text.AlignVCenter
                font.preferShaping: false
                font.kerning: false
                font.styleName: "Courier New"
                font.weight: Font.Medium
                font.bold: true
                readOnly: true
                clip: true
                font.family: "Courier New"
            }
        }    
        Connections {
            target: con
            
            function onSetTx(filer){
               text1.append(filer)
               
            }
        }    
    
    }