in this case I confront memory leak...
MainWindow memory is 23.7 MB
page1: 32MB
page3: 33.7

agian back to main window
MainWindow : 28MB
page1: 33.8MB
Page2: 33.8MB

agian back to main window
Page4:39.2MB
MainWindow: 39.2MB

each window that opens, the memory increases!
How can solved this?

My stackview Code :

toolBar: BorderImage {
    border.bottom: 8
    source: "qrc:/Icons/toolbar.png"
    width: parent.width
    height: 70
    Rectangle {
        id: backButton
        width: opacity ? 60 : 0
        anchors.left: parent.left
        anchors.leftMargin: 20
        opacity: stackView.depth > 1 ? 1 : 0
        anchors.verticalCenter: parent.verticalCenter
        antialiasing: true
        height: 60
        radius: 4
        color: backmouse.pressed ? "#222" : "transparent"
        Behavior on opacity { NumberAnimation{} }
        Image {
            anchors.verticalCenter: parent.verticalCenter
            source: "qrc:/Icons/navigation_previous_item.png"
            Text {
                font.pixelSize: 42
                Behavior on x { NumberAnimation{ easing.type: Easing.OutCubic} }
                x: backButton.x + backButton.width + 20
                anchors.verticalCenter: parent.verticalCenter
                text: "back"
                color: "white"
                font.family: webFont.name
            }
        }
        MouseArea {
            id: backmouse
            anchors.fill: parent
            anchors.margins: -10
            onClicked:
            {
                stackView.pop()
                gc()
            }

        }
    }
    Text {
        font.pixelSize: 42
        Behavior on x { NumberAnimation{ easing.type: Easing.OutCubic} }
        anchors.verticalCenter: parent.verticalCenter
        anchors.horizontalCenter: parent.horizontalCenter
        color: "white"
        text: "Irsa Soft"
        font.family: webFont.name

    }
}
StackView {
        id: stackView
        anchors.fill: parent
        // Implements back key navigation
        focus: true
        Keys.onReleased: if (event.key === Qt.Key_Back && stackView.depth > 1) {
                             stackView.pop();
                             destroyed()
                             gc()
                             event.accepted = true;
                         }

        initialItem: Item {

            width: parent.width
            height: parent.height
            MainMenu {
                anchors.fill: parent
                onClicked : stackView.push({item:url,destroyOnPop:true})
                onChangeToshowTraffic : stackView.push({item:url,destroyOnPop: true})
                onChangeToSaveEnter: stackView.push({item:url,destroyOnPop: true})
                onChangeTomission: stackView.push({item:url,destroyOnPop: true})
            }
        }

    }