I have the same issue, but it is MUCH MUCH worse than the problem here. I use Megascans trees with the lowest LOD I could use and foliage that isn’t allowed to go below LOD 2. Even with a light amount of this stuff, I get 5-10fps looking straight ahead on a small open world. I don’t know how to enable level streaming, and texture streaming says it’s on but I don’t think PIE allows that.
Please help me with this. I can’t get help elsewhere.