And I need to figure out the "highlight everything" button.
It is the Alt key on a US keyboard so I'd assume same or equivalent on a Nordic one. Don't know what those look like so I'm guessing/assuming. That is what highlights bodies and some containers and loot lying about. I wish it did more.
I run the game off SSD and I don't have the pop-in problem so there may be something to the drive you're using being a part of the problem. A lack of optimization in the streaming of assets from the drive by Larian is likely the rest of it. Defragging the drive and making sure of no bad sectors might help a tiny bit if they are issues the drive actually has but I have very low expectations there. You may just be stuck waiting for Larian to fix the problem or at least make it tolerable before you can play the game on that system again.