pyqt performance issues on dynamic widget array-like table - pyqt

Question

I have a GUI that uses a custom QStyledItemDelegate, QTableView and QAbstractModel to display records that I load at startup.
Each record is displayed as a row of widgets. Each column is associated with a specific widget type. I.e. a QDateEdit, a QTimeEdit, a couple of QLineEdit, 3 QComboBox.
If I try to load ~2500 records the GUI takes a lot of time to load, as well as adapt to changes when some of the filters are used. Scrolling is not excessively bad though, so I suspect I might be doing things inefficiently when it comes to add or remove widget rows.
Row addition is always an append. Row deletion can happen everywhere.
These are the implementation in my model:
def row_append(self, count=1, parent=QtCore.QModelIndex()):
rows = self.rowCount()
last = rows + count - 1
self.layoutAboutToBeChanged.emit()
self.beginInsertRows(parent, rows, last)
self.insertRows(rows, count, parent) # Implemented in my model
self.endInsertRows()
self.layoutChanged.emit()
for column in range(self.columnCount()):
self.table_view.enable_cell(rows, column)
return self.rowCount() - count
def row_delete(self, row, count=1, parent=QtCore.QModelIndex()):
last = row + count - 1
self.layoutAboutToBeChanged.emit()
self.beginRemoveRows(parent, row, last)
self.removeRows(row, count, parent) # Implemented in my model
self.endRemoveRows()
self.layoutChanged.emit()
The implementation details of my version of insertRows and removeRows are not relevant, as I can deal with that.
If I receive 500 inserts or 351 deletes, I will call these functions.
My issue is if this is how it's supposed to be done when you get a huge batch of things that causes most of what's currently being displayed to change.
I remember reading that if you have to make big changes, it might be easier to destroy everything and rebuild from scratch, but:
Am I using the wrong approach (e.g. functions used and implemented) to destroy everything? Similarly for when I rebuild everything from scratch.
Could it be that I'm trying to build something too heavy for pyqt?