When the height of a delegate is bound to the height of a ListView with a large model count, the application is blocked for several seconds

import QtQuick 2.6
import QtQuick.Window 2.2

Window {
    id: window
    width: 400
    height: 800
    visible: true
    color: "#444"

    ListView {
        id: lv
        anchors.fill: parent
        model: 73000
        onCountChanged: print("count", count)

        delegate: Item {
            width: 100
            height: lv.height
        }
    }
}