Premiere 23 extremely slow and CPU-consuming // comparison to Premiere 22

Hello there,

i have (as have many apparently) extreme performance issues with Premiere 23.

So I installed both, 22 and 23, parallel on my mac, and loaded an older project in each instance.

Scenario:

Premiere 22 is focussed and plays timeline.

Premiere 23 is idle and in the background.

This is what the CPU has to say to this:

If I now shift 23 into focus and play the timeline and send 22 to idle, this happens:

Premiere 22 is idle at 0,1% CPU.

How is that possible and what can be done to fix it.

Both installations are clean and with resetted preferences and cleared caches.

My specs:

Thanks, Hauke