It may be choking on too large of a threadcount. By default Starfield creates as many workerthreads as what you have cores. And it scales really badly. For your setup it likely makes 32 threads like it does on my 16 core Zen4.
I limited mine to the same as what the consoles have and it made things quite a bit smoother. You can try adding these to your StarfieldCustom.ini
I limited mine to the same as what the consoles have and it made things quite a bit smoother. You can try adding these to your StarfieldCustom.ini
[General]
uMaxPrimaryJobThreads=8
uMaxSecondaryJobThreads=8