I have a 160 MB file that takes more than 1 minute to open.
I have 4 GB screenflow files that open almost instantaneously.
I found another SU file of 159 MB and opened it. It took less than 30 seconds.
I’m curious what might be wrong with the slow opening file and if there is a way to correct whatever the issue is.
I’ve purged the file and it made no difference in open time.
This is on an M1 Max Macbook Pro with a 2 TB SSD drive using SU 24.
Hard to say. Might be different textures, Maybe different quantities of edges. Maybe it’s style related. Can only guess without seeing the file.
That’s hush hush super top secret, Dave! 
you can download it at the link here
If it really is you should remove it from DropBox and remove the link from your post.
Do you suppose it’s the over 5 million edges in the model? There’s a ton of them in the imported component and there’s two instances of it that overlap. Surely you don’t need both of them.
I see a lot of incorrect tag usage.
That C3-R2 material is kind of obese, too.
Do you need all the text and junk in that import?
What is the relationship between, say, the edges and file size or time to open? The other file I mention in my post, @ just under 160 MB, only has about 1.79 million edges. It opened in 30 seconds this morning.
What is that “Default Tag Geometry” warning box showing me? And where is the incorrect tag usage occurring? I’m generally pretty good at leaving geometry on “Untagged” (thanks to you ages ago), but I don’t expend a lot of effort to delve into the groups in things like those imported plans. That’s pretty time consuming. Things like the “text and junk” that come in with the PDF plan import (I assume that’s the import you’re talking about) take a pretty significant amount of time to go into the nested groups and delete and simplify.
Material C3-R2, how do I determine what object that is on? It also sounds like something I’ve imported. Normally, anything brought in from the 3D Warehouse is initially imported into a new file (also something I remember learning from you) where I can control the tags being brought in, but I’m not checking out the materials used in the import too closely. Obviously, that would be a good thing to start checking on.
Material Resizer - that’s a ThomThom plugin?
You know, Dave, you could make a fortune, and serve a wider community extremely well, creating a course with all of these tips and tricks you know. Kinda like what Justin Geis does with his courses.
I appreciate your help, Dave, and, as always, am in awe of your knowledge.
I was working ona reply but I see Anssi is replying so I’ll stand down.
Interestingly, I restarted SU this morning and the file only took 15 - 16 seconds to open this time around. And, I restart SU a lot, so this seemed like somewhat new behavior.
Another possible aspect, it occurs to me now, is that at any given time I could have a dozen open models. Not all at 160 MB. But I wonder how much of a factor that might be.
When you open a SketchUp file, the number of faces and edges is what mostly determines performance. Textures and their size have their role, but it is minor. The size of the file as saved on your disk is also of minor importance, as with the use of components it can be brought down without reducing the actual “geometry” the application has to process. And, when you zoom or orbit, it is your CPU that has to process all the “geometry” whereas your graphics card processes the textures and shadows. I wouldn’t say that 1.79 million edges is “only”- it stands near the limit where the model bloat starts to be felt when you work with it.
Well, the “1.79 only” comment was just made as a comparison to the 5 million Dave alluded to in my model in question.
That high edge count has to be in the imported objects and not the objects I’m modeling. I need to be paying much closer attention to that, I can see.
Thanks for the information, Anssi, on file geometry and size. It’s early here in AZ and I’ve already learned something new today!
Bob
Another question just occurred to me:
In terms of edge and faces count and the behavior of the model, is it gross edge count in the model that is a factor or just displayed edge count as a function of what tags are visible? This model may have 5 million total edges but only a small subset of that count is displayed at any time because many tags are toggled off.
Interesting that I can see your latest reply in my email notification but refreshing this browser page doesn’t bring it up.
Lots to digest there, Dave, but thank you very much, once again, for all your help. I will definitely take the time to trim this model down using your suggestions here!
Bob
The effect would be on the system memory. I do not know how it is handled in the Apple eco system.
There are multiple bottlenecks which affect the speed of how things run.
One thing is rendering what can be seen and one thing is handling the data.
Each line in your model has to be drawn by Sketchup, if you have 1 million lines and each one takes a split second to draw that individual line, then the more lines you have the longer it takes to create a single image. Every time you rotate or zoom it is drawing it again.
Then you have the data side of it - a model made with 1 million lines is 1 million pieces of data, each and every line has metadata against it.
Even if you have hidden it, the data is still being looked at - it might being looked at to define whether or not it is visible and needs to be rendered.
SketchUp tends to be more sensitive to the latter as do many 3d packages.
SketchUp inferences quite happily to “raw” geometry even if it is hidden.
