QTableWidget loading data too slow

when I display data with QTableWidget, I find that if you call setSelectionResizeMode() and pass  QHeaderView::ResizeToContents parameter to this function, the program costs a long time to load my data(the table is not very large), and it  seems crashed. But if you replace the parameter with QHeaderView::Interactive, QHeaderView::Fixed or QHeaderView::Stretch, it shows my data in an instant.  The larger the table is, the slower the program.

The code is simple. please view the attachments.