Flet app startup issue in Windows Build

[wpritom]

Inconsistent performance in Windows build has been observed. There are 3 scenarios after running the executable file.

1. UI Loads instantly
2. UI loads after a waiting for a few seconds
3. UI does not load even after 10 seconds. (seems like app has been crashed)

There is no way to sense the reason behind this behavior. This happens for as simple code as following:

import datetime
import flet as ft

def notify_user(e):
   pass

async def main(page: ft.Page):

    tool_column = ft.Column([ft.Text("HELLO")])

    page.add(
        tool_column
        )

ft.app(main)

The app is build with the following command.

flet build windows --project sample--module-name app.py --output build --verbose

OS : Windows 11 Python: 3.12.4 Flet: 0.23.2 Flutter: 3.22.3

The build is also tested in other desktops. The behavior was same.

[suifeng2018]

the same issue! UI loading very slower

[imadityacoder]

It also happening with me. UI not refresh automatically.

[ndonkoHenri]

Will you guys mind sharing a screen record?

[baseplate-admin]

Sounds like the issue i faced in

• https://github.com/flet-dev/flet/issues/3738

---

Will you guys mind sharing a screen record?

I shared a screen record

[VordyV]

I observe the same situation. In demonstrating this problem, the program was build using "flet build windows" command, there were no errors during assembly, the code was taken from the example.

https://github.com/user-attachments/assets/2714be92-4d20-4f74-b6fa-d7005266d146

[wpritom]

This problem still remains in the latest version (0.24.0).

[imadityacoder]

It is also happening in android

https://github.com/user-attachments/assets/b2eb70de-382d-44b1-8e35-56bee07642f0.mp4