One very slow big project only has a few interior objects, the rest is only planned [:))]
I'm looking into breaking it up into parts but the overall building will be lost when I do that. It's a 228meter two-level 12-sided ring with a second building in the center and a 'smaller' underground level. That's big.

I'm now looking into exporting the whole thing as an obj file and convert it to glTF. Then see if that loads and moves better with something like View3D . The basic size remains so I'm too hopeful.