I get frequent “not Responding” errors while working. Also, saving seems slow. Please check for problems. I am running Sketchup 2017 Make.
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You seem to have View, Edge Style, Profiles turned on. That makes a dramatic difference to how demanding the scene is. I think you will laugh out loud when you see how much faster things are with that turned off.
It is generally a demanding model, with over 2 million edges, and nearly 14,000 component instances, but there is a lot of things in the model.
It doesn’t affect performance, but you could switch to Face Style, Monochrome, and look at all of the faces that are not the lighter color. Those are reversed.