The main problem with your model is excessive detail (excessive entity counts) for the way objects are used in the model. Examples:
100 segments for the circles in these pipes is more than you should really need. 48 would be plenty for the job.
Again, excessive numbers of sides in the rings on the ramps. Do you really need the radii on the underside of the decking channels? Do you really need the bars that are welded onto those channels.
You should also take the time to fix incorrect face orientation. Don’t leave exposed blue back faces.
The overhead cranes seem to be more detailed than they ought to be for the way they are used. Do you really need the details on the motor? Do you need the bolts and gussets where the beams meet the columns? More exposed back faces here to fix. It would also be a good idea to soften edges in a lot of the objects in your model.
Does the regulator on the welding gas cylinder really need as much detail as it has? Does the screw head on the knob add useful information? For that matter does the regulator add useful information?
On the topic of welders, Do they really need all that detail? Again, reversed faces and edges to soften.
I’m thinking you could do a lot simplification here. Probably no one would miss the the knobs and other details on the welder boxes. You could get rid of the coiled hose on the cart and even the forks on the caseters.
You could replace the 3D Text with texture images of the signs. This one, for example. There are others, too.
Here’s another spot that could use attention. Choose one set of doors or the other. Shipping containers don’t have two sets of doors and shouldn’t be transported with the doors swinging free like you show. (That’s a sure way of knocking some unsuspecting person off their motorcycle). The containers could also be simplified by removing the small details. And yet again, lots of incorrectly oriented faces.
The trucks could also be simplified. Do they need engines and drivetrains? Do the tires on the trucks actually need 3D tread?
Another place to look is the barge tow. Do the bolt heads on the radar unit really add useful information?
How about the search lights, camera, horn, ladders, or the electrical stuff behind the mast?
What about the lifeboat pods and life rings, water cannon, the grid tread on that ladder, or any of myriad other small details? Of course more incorrectly oriented faces to fix, too.
In some cases it seems like a small thing to worry about. The screw head on the knob of the welding cylinder, for example. But you have many copies of the welding cylinder in the model so the entity count multiplies. In your model you have so many copies of so many overly detailed objects that it’s really dragging the whole model down.
Figure out what “story” your model needs to tell and leave out the bits that don’t advance that story.
I notice incorrect tag usage in your model. Untagged should be left active at all times.
ALL edges and faces should be created and remain untagged. This is the result of fixing the incorrect tag usage.
And then purging unused stuff. You had purged unused components, which is good.
I did run CleanUp. It took a little time but it didn’t crash. Not Responding generally means SketchUp is busy doing something and won’t respond until it is finished.
The cleanup I did only reduced the file size by about 2 Mb but I didn’t go through and remove all the excessive details. I don’t know exactly what “story” you are trying to tell so I haven’t removed any of what I think is unneeded detail. You’d need to do that.
Think about your modeling project as having a budget. That budget is determined by your hardware and time (to wait for your hardware to do its thing). That budget determines how much you can “spend” in edges and faces and textures. As with any project you have to figure out where you spend to get the most bang for your buck. If you spend it on things like engines and differentials on trucks or search lights on a tug or screws and knobs on a welder, you can’t spend it on other possibly more useful stuff elsewhere in your model.
I’ll add that I know it seems like a lot of work to go through and slim things down in this model. Generally it’s easier and faster to do this from the beginning. Don’t spend your money on solid gold plumbing if you’re going to embed it in concrete. It’s cheaper to decide to use PVC or cast iron before you lay the pipe and pour the concrete.
