Memory Management in Qml

Saman19

Hello.
I developed a program by Qt and Qml!
My application has several window that works with stackview.
every time clicked on button, stackview push new window and if clicked on back, pop window!

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})
            }
        }

    }