I am working on a Dell Precision 3530 workstation. It is not underpowered.
My video project is dead simple. The audio sounds good in Nero Video, VLC media player, and OpenShot video editor.
The problem is in ShotCut which is a shame because it has some cool video editing features that the others don’t which is why I wanted to try it.
I just tried Preview Scaling and Proxy editing. No difference. Audio is still very bad.