why first QMenu initializing so heavily?

Question

simplest script: its just show context menu with 2 elements after running but first QMenu initializing is more slowly when i expected 0_o

it seems Qt to be not optimized for such a usage scenario?

after run script:

• Main Window show immediately
• but context menu show after ~0.7-1.2 sec after running

it's not a problem for me, but i'm just wondering - why is reason that behaviour of Qt and ways to improve perf if it possible

• perf_counter() show, that all script processes ( until -> menu.exec(QCursor.pos()) ) executed by 0.06-0.09 sec
• i compiled script by "Nuitka", but speed is the same
• on windows os i have "autohotkey" script, and it run custom context menu instantly
• run platform windows 10 18362 64x
• python 3.10.4 virtual env not use
• run script *.pyw without console output

differ codes i trial - result is similar this is one of:

import sys
from PyQt5.QtGui import QCursor
from PyQt5.QtWidgets import (QAction, QMenu, QApplication)

"""
for Qt6:
from PyQt6.QtGui import QCursor, QAction
from PyQt6.QtWidgets import (QMenu, QApplication)
"""

def context_menu():
    menu = QMenu()
    
    action1 = QAction("Exit option")
    action1.triggered.connect(lambda: sys.exit())
    
    action2 = QAction("Second option")
    action2.triggered.connect(lambda: print("You have clicked the second option"))
    
    menu.addAction(action1)
    menu.addAction(action2)
    
    sys.exit(menu.exec(QCursor.pos()))

app = QApplication([])
context_menu()