When using listview to display millions of data, the spacing will become larger and smaller.

FQCD99

import QtQuick 2.0

import QtGraphicalEffects 1.0

Item
{
    width: 1000
    height: 1000
    MouseArea
    {
        anchors.fill: parent
        onClicked:
        {
            testListView.positionViewAtEnd()
        }
    }
    ListView
    {
        id:testListView
        width: 500
        height: 600
        model: 1000000
        delegate: listViewDelegate
    }
    Component
    {
        id:listViewDelegate
        Rectangle
        {
            width: 500
            height: 100
            color: "red"
            Text
            {
                text: index
                anchors.centerIn: parent
            }
        }
    }
}

There is a problem when running the above code, how should I solve this problem.