Sketchup Models Perform Poorly and bring Editor to a halt.

I'm very new to Unity. I've been tasked to build a walk-through of a conveyor system. It is quite large. The problem is when I drag a .skp file into Unity and then into my scene Unity slows to a crawl. If I play the "Game" it shows batch counts in the 100,000s. If I explode the model beforehand it seems to actually run better in Unity. It doesn't make sense, because the .skp file becomes much larger after exploding. I've tried occlusion culling (baking takes forever) and generating lightmaps. Quality set to Medium. Shadows turned off. Doesn't seem to make much difference to the performance. Is Sketchup the problem?

Thanks in advance!

p.s. The model contains Dynamic Components from Sketchup if that makes a difference.

Using a Dell Precision 7520 Laptop
Unity 2019.1.8f1
Windows 10
Core i.7 - 3.1 GHz Processor
32 GB Ram
NVIDIA Quadro M2200

Jeff