@box said:

The import dialog that opens in which you choose the file to import has a large button just next to the Import button that says Options.

Thanks, I've never even noticed that before!

How do you open up that STL Import Options window? When I import an STL, SketchUp automatically does it without providing and options.

Is there a way or perhaps a plugin that will auto delete unnecessary lines in a model? Specifically, when importing other file types such as STL or DWG. You know, all those extra unnecessary lines on each face going to every corner of it even if it's a flat surface.

@box said:

There can be various reasons for slow performance, from inefficient workflow to some flaw in the computer settings. Without seeing an example of your work we can only guess. A large file size doesn't always mean slow, I was working on a 415mb file only yesterday on a very low end laptop without any stutter. And I can create a 100kb file that will bring the best PC to it's knees.
A model to look at would help us to understand if it is your workflow or your system that would benefit from some tweaking.

Here's the model that I'm working on. Let me know if I can optimize it any more.

@box said:

A more efficient way of making this type of structure, using components, would be to make a hole component, including the faces, as a square/rectangle, array those and hide the joining edges.

Thanks again! I've already started to do this with my models. I guess I was more concerned about the end file size rather than it being optimized for using, good to know.

Thanks for the tips, I'll give them a try when I get back home. As for using textures, I just don't like how they totally disappear when moving around on highly detailed models.

@makro88 said:

Are you using sketchup with the outliner open? With complex models, it can really slow sketchup down

No, I don't have Outliner open while I use SketchUp.

I purge all my models prior to saving them, so yes, I've purged it and made every possible duplicate geometry a component. I also never have shadows on at all.

EDIT: Also, I've always thought that SketchUp was more GPU intensive rather than CPU.

It's about 100MB big. I can still view and edit the model in SketchUp but the lag is just unbearable. I have to use another instance of SketchUp to work on a portion and then paste it into the original model.

As the titles says, why does SketchUp start to perform really slow with increased amount of detail in a model on pretty high-end hardware? I don't get this kind of performance hit when I use 3ds Max.

My system specs:
Core i7-6950X
128GB Memory
2-Way 1080 Ti in SLI
950 PRO M.2 NVMe SSD