QTreeView very slow sorting - qt

Question

Sorting QTreeView with QSortFilterProxyModel is extremely slow (compared to basic QTreeWidget). What's wrong with the code? How can I speed-up?
# coding: utf-8
import sys
from PyQt5.QtWidgets import (QTreeView, QAbstractItemView,
QMainWindow, QApplication)
from PyQt5.QtSql import (QSqlDatabase, QSqlQuery, QSqlQueryModel)
from PyQt5.QtCore import QSortFilterProxyModel
class Database:
def __init__(self):
self.db = QSqlDatabase.addDatabase("QODBC")
self.db.setDatabaseName(
r'Driver={SQL Server Native Client 11.0};Server={(localdb)\v11.0};')
self.db.open()
class Model(QSqlQueryModel):
def __init__(self, parent=None):
super().__init__(parent)
query = QSqlQuery()
query.prepare('SELECT * FROM Companies WHERE Name LIKE ?')
query.bindValue(0, '%elektro%')
query.exec_()
self.setQuery(query)
class TreeView(QTreeView):
def edit(self, index, trigger, event):
if trigger == QAbstractItemView.DoubleClicked:
return False
return QTreeView.edit(self, index, trigger, event)
class Window(QMainWindow):
def __init__(self):
super().__init__()
self.db = Database()
self.model = Model()
sortFilterModel = QSortFilterProxyModel()
sortFilterModel.setSourceModel(self.model)
treeView = TreeView(self)
treeView.setModel(sortFilterModel)
treeView.hideColumn(0)
treeView.hideColumn(9)
treeView.setIndentation(0)
treeView.setSelectionMode(QAbstractItemView.MultiSelection)
treeView.setAllColumnsShowFocus(True)
treeView.setSortingEnabled(True)
treeView.clicked.connect(self.row_id)
self.setCentralWidget(treeView)
def row_id(self, index):
if index.isValid():
id_ = index.sibling(index.row(), 0).data()
print(id_)
if __name__ == '__main__':
app = QApplication(sys.argv)
window = Window()
window.show()
app.exec_()

Answer 1

Some tips (from a C++ perspective, so i could be missing something )
QTreeView is known for being slower than a QTableView and consume a lot of memory And you are using a plain table model anyways, so, try with a QTableview.
Also, in a real tree hierarchical model hiding column 0 would hide all child items.
Try using QSqlTableModel instead of a QSqlQueryModel, it has convenience setSort, setFilter methods and only fetchs visible rows. So i would be probably faster.