Hello Sproutsradio,
If you have long wait times, I’m assuming you might be using vector or hybrid for some of your SU view-ports.
Personally, coming from an Autocad background, I always leaned to vector PDF outputs because I liked the crisp line work as well as the small PDF file sizes, which unfortunately for LO, causes huge delays.
I’ve posted several times on this forum with suggestions of how the LO team might be able to speed things up by utilizing a technique to harness the full power of multi-threaded CPUs. Hopefully they give it a try.
Until then, I decided recently to give up on vector or hybrid, and spent the time to refine my style settings to get very nice outputs from raster view-ports.
The key is to not use JPG compression for images when you export. This will result in clean backgrounds. You then need to play with the Style in SU (Profiles, Depth Cue, Section Cuts…) and the Line Scale in LO until you get the level of detail you want with the line weights that read well for your drawing output.
In my case, in SU I use:


And in LO I use:

After converting all vector/hybrid view-ports to raster on a recent project I’ve been working on, my “Render Models In Document” (which renders all view-ports on all pages in one go) time went from 5 to 10 minutes to under 30 seconds for 22 Pages.
I can now update a page with 5 or 6 view-ports of a 70Mb SU file in less than 5 seconds.
Your 9MB model in raster renders is a fraction of a second for me.
Hope that helps.