How to display marquee animation of QProgressBar properly when using it in QTreeView

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I'm already using persistent editors in another column in the QTreeView (QComboBoxes).

Do you think that I have to expect performance problems?
I've just tested my application with 218 rows (although I think more than 50 rows at the same time are already unrealistic). The CPU usage is a bit high I'm resizing the window or the columns but I think that's not a big problem. The memory usage is also ok.

EDIT: I've tested the application again with 218 rows, but without the usage of persistent editors. The CPU usage is only a few percent lower and the memory usage only about 5 MB.