This is just a test I made over the last few days using some of my preexisting materials to see how well they would work with Unreal Engine 5 using nanite. All the assets were made very simply by creating primitives and using displacement maps to add the details. Most of the assets are a million plus tris and the tower itself is around 11 million. Having said that, the entire scene never went over 2 million tris in view at a time according to the nanite stats. The only assets not made by me are the landscape material used in the distance and the pine trees. Using DLSS quality mode I was able to get a solid 70ish fps with a few dips into the low 60s mainly when looking at the trees.
You can check out a breakdown of the scene on my artstation profile here: https://www.artstation.com/chrisg4919
