Thank you for the answers @UnrealVerseGuru & @HalcyonKnight96.
@HalcyonKnight96, how can I share a copy of the project with you? Maybe that way you can help me pinpoint the problem.
@UnrealVerseGuru I have tried removing all LODs (every mesh has only 1 LOD now) No big change, only a couple of MB.
Most static meshes are walls and columns.
I’m attaching the top primitives and textures statistics to see if any of you can point to something obviously wrong. This is very helpful for future readers as well.
Primitives
Textures
thanks in advance!