Slow Startup Time on Windows Compared to macOS and Suggested Improvement

[hkyuei]

Hi NiceGUI team!

First, thank you for this amazing project! I’ve been using NiceGUI on macOS, and it works flawlessly with near-instant startup. However, I noticed a significant delay (5-10 seconds) when launching the same application on Windows 11 (tested on multiple machines). During this time, the user sees no feedback (blank window or no UI), which creates a poor experience for first-time users.

Problem Details:
OS: Windows 11 (latest updates)
Python Version: 3.10+
NiceGUI Version: 2.11.1
Suggested Solutions:
Performance Optimization: Investigate why Windows startup is slower and address bottlenecks (e.g., file I/O, dependencies).
Immediate Feedback: Show a loading screen, placeholder window, or browser tab with "Loading..." text immediately after launch, even if the backend isn’t fully ready.
Additional Context:
This issue doesn’t affect functionality but harms user perception, especially for non-technical users who might think the app is frozen.

Could the team look into this? If needed, I’m happy to provide more details (logs, profiling data, etc.).

Thanks for your hard work!

[rodja]

@hkyuei have you compared to #3652 and #3921? Or is this a duplicate?