You have more patience than me; I wouldn’t wait 25 minutes for sure!
Awesomely, due to an extremely generous forum user, I can now at least access the UI and load files to experiment and see what they look like.
The file is incredibly complex because none of the pathing that could be connected is connected. For example, the cut line defining the shape of the lizard is comprised of almost 60 separate paths when it could be just one single path. Every single direction change in a path creates a new path in the document. Just a few minutes of clean-up and I was able to reduce the document from 33,151 paths to 7,020. Not only does this process a ton faster but it should cut faster and cut better.
I also received some weird warnings related to Inkscape after I had modified the file:
error on line 16 at column 105: Namespace prefix inkscape for connector-curvature on path is not defined
Inkscape definitely adds a lot of stuff to an Inkscape SVG file and it doesn’t seem to play nice once edited anywhere else. Eek. That’s a mess. No idea how the Glowforge interprets those commands, or, if they ignore the Inkscape-related XML, the file isn’t able to parse correctly…
I copied the items over to a new document and saved them as a completely fresh SVG and it was no problem. Anyways - I know that doesn’t answer your question as to what the object limits are… but, just some ideas on how to clean up the file and get better performance.