I just ran into an interesting thing that I can’t explain. I have a model that I have cleaned up carefully, purged, reduced texture sizes, etc. to get the file size down to about 5 MB. It works fine like that, and I’m happy with it. But if I simply open the “Components” tray, without doing anything else (ONLY opening the window; not doing anything in there, not even selecting a component), then I save the file, the size has now suddenly jumped by nearly 70%, to 8.4 MB. Very strange, very explainable. Why would opening that specific window cause it to somehow generate a whole bunch of new stuff inside the model? If I then close the Components tray window again (still without having done anything), and purge it, the file size does not change: it stays at the new 8.4 MB size.
Has anyone seen this before? Why does that happen? Is there anything I can do to get the file size back down to where it was, AFTER I open the components tray?