High CPU consumption and overheating when network access is blocked by a local firewall

Issue type

Other type of issue

Description with steps to reproduce

The high CPU consumption can be triggered when using the macOS open-source firewall LuLu (https://github.com/objective-see/lulu) to manage network permissions. Testing under different network conditions yields the following results:

Wi-Fi Connected + Network access BLOCKED via LuLu: CPU usage spikes significantly, and the Mac starts overheating.

Wi-Fi Connected + Network access ALLOWED via LuLu: The application runs normally with standard CPU usage and no heating.

Wi-Fi Disconnected: The application runs normally (as MuseScore makes no attempt to request network access).

Supporting files, videos and screenshots

In which versions of MuseScore Studio is this issue present?

4.7.4

Regression

I was unable to check

Operating system

macOS 26.5.1

Additional context

Hypothesis

It appears that when MuseScore attempts to access the network but is continuously blocked by a local firewall, some internal network retry logic might fall into an infinite loop or poll too aggressively, ultimately leading to the high CPU consumption.

Checklist

• This report follows the guidelines for reporting bugs and issues
• I have verified that this issue has not been logged before, by searching the issue tracker for similar issues
• I have attached all requested files and information to this report
• I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible