Slow deletion from QML TreeView

https://github.com/DimaKoltun/Slow-Remove-From-QML-TreeView

shows that deletion 500 items from QML TreeView takes ~10 seconds (on my PC), but for QML ListView the deletion is instant, widget QTreeView also relatively fast.
Why deletion from QML TreeView so slow, but for QTreeView is fast? What difference between implementations?

is it https://marketplace.qt.io/products/treeview faster remove items than qml TreeView from Controls.1?