I am using the latest version of Premiere on two different machines in two locations 55 miles apart.
One machine is running Windoes 11 Pro and the other, Windows 10 Pro that I remote into at work.
In both places, if I have the Audio Track Mixer visible, the playback "stutters". The playhead jumps, timcode display is not smooth, video stutters, but audio playback is fine. Keeping the Track Mixer open but switching to the Audio Clip Mixer, Source, Effects Control Tab, playback is smooth.
The material I work with is a simple 2 channel XDCAM 422 1920x1080 file that are :30 in length.
At home, I tried to playback an Apple ProRes 1920x1080 with 16 channels of audio. All plays nice and smooth until I display the Audio Track Mixer. Playback stutters, but after a few seconds, the audio goes mute! Switch to the Audio Clip Mixer or anything else and playback is fine, even while the playhead is moving.
Bob K.