Applications requires several seconds to become responsive depending on the number of items in scene

import QtQuick 2.15
import QtQuick.Window 2.15
import QtQuick.Layouts 1.15

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    ColumnLayout {
        anchors.fill: parent
        spacing: 1

        Repeater {
            //model: 10    // ok
            //model: 100   // ok
            //model: 1000  // ok
            //model: 10000 // ok
            //model: 12500 // ok
            //model: 25000 // more than 5 seconds to become responsive
            //model: 50000 // more than 20 seconds to become responsive
            model: 100000  // 1.5 minutes to become responsive
            delegate: Rectangle {
                Layout.fillWidth: true
                Layout.preferredHeight: 1
                color: "black"
            }
        }
    }

    Rectangle {
        anchors.fill: parent
        color: "transparent"
        opacity: 0.5

        MouseArea {
            anchors.fill: parent
            onPressed: parent.color = "gray"
            onReleased: parent.color = "transparent"
        }
    }
}