File size growing

I am working with Dimensions almost everyday, and still facing the same problem with file size growing too much, until I have to quit Dimension. So far, I´ve found one solution for reducing the file size by importing models as OBJ and exporting them as GLTF, then importing as GLTF. That reduces the size a lot, but I face the same problem again, when duplicating models. Does anyone know how to duplicate models without increasing file size?

Macbook and my other computer is not the problem anymore. It should be all about the repeating codes when duplicating models...?