This has been answered before.
To sum it up, (if I understand what you’re asking correctly) the more triangles you have in a certain area (CSG, MeshParts and just ordinary parts) the harder it is to handle these parts.
This has been answered before.
To sum it up, (if I understand what you’re asking correctly) the more triangles you have in a certain area (CSG, MeshParts and just ordinary parts) the harder it is to handle these parts.