High CPU usage even when idle (25%)

Description:

MuseScore 4.4.4 on Porteus 5.01 uses about 25% CPU when idle, even without any interaction or playback. This is much higher than MuseScore 3.6.2, which uses around 0-1% CPU when idle.

Steps to Reproduce:

1. Start MuseScore 4.
2. Create a new score (choose "Symphonic Orchestra").
3. Wait for the audio samples to load.
4. Minimize the window to ensure there is no keyboard or mouse interaction.
5. Run top or another system monitor to observe CPU usage.

Expected Behavior:

MuseScore should use little to no CPU when idle.

Actual Behavior:

MuseScore uses approximately 25% CPU even when idle, which seems unnecessary and leads to battery drain.

System Information:

• OS: Porteus 5.01 (64-bit)
• CPU: Intel® Core™ i5-4200M CPU @ 2.50GHz
• RAM: 7.7 GiB
• GPU: Intel® HD Graphics 4600
• MuseScore Version: 4.4.4 (AppImage)

Additional Information:

This issue is specific to MuseScore 4, and MuseScore 3.6.2 does not exhibit this behavior on the same system.

Supporting files, videos and screenshots

What is the latest version of MuseScore Studio where this issue is present?

MuseScore-Studio-4.4.4.243461245-x86_64

Regression

Yes, this used to work in MuseScore 3.x and now is broken

Operating system

Porteus Linux 5.01 64 bits xfce

Additional context

No response

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