Sketchup connector is slower than our other connectors and that’s because of Sketchup’s way of handling meshes. We have to make some checks before creating valid faces and that makes the process slower. In your model, it is the Terrain that is causing the issue. It has a bunch of small vertices.
It is on our roadmap to speed up receiving in Sketchup. I created an issue on Github so we don’t forget about it.
It’s weird, I didn’t expect this as I know Sketchup can get a pretty huge Geo-Locations (topography) and process it with ease
Any way I’m waiting for your fix.