Logic Pro X playback stutter on brand new Mac Studio M4 - Sequoia 15.4.1

I used Migration Assistant. I'm not using any 3rd party plugins by the way.

There's a possibility that my Behringer Xenyx Q802USB that I use as a recording interface and output might be the problem. I can't find any software/firmware update on Behringer's website.

But you're playing the track when you're recording. If I can't even get it to play without stuttering how am I going to record? I was neither recording nor mixing. I was just listening to recorded guitar tracks to see if they were good enough. I'd just called the file up for the first time after transferring everything to the Mac Studio.

I don't seem to have this Mic Mode. I don't get the icon in the Menu Bar nor any controls in Control Centre. Do I need to turn on Accessibility for this?

As for the other issue, as I've mentioned elsewhere in the thread, I did try once with the Studio Display Speakers enabled instead, and it was ok but I may have got lucky. I've put in a support request to Behringer, but oddly since I've tweaked and turned things on and off and restarted a couple of times, the problem seems to have stopped, cross fingers. Will be worth resolving any settings that might cause future problems though.

If you mean the I/O buffer in this picture I'm using 128 but I've tried it on 64 too.

I played it back once using my studio display speakers and it didn't stutter but I may have got lucky.

Obviously the Mac Studio arrived with a new OS install and it also did an update when I was getting it up and running. Is it best to delete Logic Pro and reinstall from the App Store?

It only goes up to 1024. I've had problems with recording latency in Logic when I put it up high.