As I said, the performance is low specifically because the content for this level was never designed to be used with Nanite. It’s a worst case scenario, as Nanite’s performance is hindered by masked materials.
Assuming things should run fast because they’re stylized is also a bad way to think about performance cost, especially in UE5. Most of the costs are not dependent on the geometry of the scene and will scale similarly regardless of the style. Lumen isn’t any cheaper in Fortnite just because it’s “stylized”
None of this was really the point either, I just wanted to see how GPU performance had changed in a controlled scene across versions using a large scene.