leave out things (furniture, 3D trees)
set the "resolution" for GDL objects to a lower setting (unfortunately, this is object specific, so would take a while to correct)
use dedicated software to compress 3D surface meshes (e.g. Vizup) to use less faces. Might distort the 3D models.
--- stefan boeykens --- bim-expert-architect-engineer-musician ---
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