Created Too many large D5 file (55GB)

Hello, I made interior SketchUp bedroom and it’s 2.52 GB file size…
then I put it to D5 pro and make material, camera, lighting, etc… now D5 file size (asset, resource, .drs, .skp) 8.05 GB

another project I have done it’s now 55 GB file size… it’s included 2 stories house 3GB SketchUp model file, but D5 too many large…

i think this going wrrong wy\ay… please advice me thanks.