Showing us your PC idle state while it’s doing nothing is meaningless. Could we please see how your hardware behaves while you’re having problems / experience slowdowns. This should give you a good idea regarding which components are being taxed. Perhaps there is a hardware bottleneck, perhaps UE5 is misbehaving.
It’s impossible to tell atm.
Its just an empty landscape with 1-2 trees on it .Why this should be a heavy load?
It’s not heavy load. How difficult is it for you to replicate and demonstrate the undesired behaviour? How often does it happen?
Also, could you tell which assets are causing issues. I’ve seen many threads where the marketplace assets themselves were the problem due to their lack of optimisation / game readiness. Some assets are great for cinematics only while some may be game-ready. Admittedly, it was a while back.
Another question - are you using Nanite?