Slow QStandardItem::setChild

[moijhd]

Hi,

I have QStandardItemModel model.

When I add an item to the invisibleRootItem() of the model with setChild, it takes me arond 200 ms.
When I add an item to an item of the model with setChild, it takes me around 0 ms.

Why is it slow ? How to do it better (because I really want to add items to the invisibleRootItem()) ?

Thanks.

Temporary answer :
I had this effect when I was doing on the item (or on the invisible) a setRowCount and a setColumCount.
I still have something slow...I need to figure out where it is...