Edit
This is an open issue and appears to be related to alsa audio.
A workaround is to shutdown the audio mixer, or install pyGame from sour
We fixed this in pygame 2. It does not take 100% of a CPU core on some linux systems anymore.
python3 -m pip install pygame --upgrade
As of pygame 2.0.0, it may be better to install pygame from source on some linux systems.
cheers,