Playtown 1 was very optimized, I don't know what you're talking about. And yes, we used multiple LODs for each mesh, Level Streaming Volume, MipMaps and Occlusion for optimization!
Okay, I was saying it in general, independent developers using Unreal Engine 5 have a big optimization problem.
I tried happyland and this without problems.
Playtown 1 good, but with some bugs
I only mention it to be sure to pay what it's worth.