Okay so datamining of models suggest that the details of cims are way overworked with 40 000 polygons or more for details you cannot see in the game (you can't zoom in that far).
The performance of the game is... not good for a lot of players that struggle with framerate dips down to <10 fps on 30-series NVIDIA cards.
I don't know much about gamedev or 3D modelling but this seems like an odd choice.
