Didn't see anyone mention about optimizing images. Reduce size if needed and run images with an image optimizer. I've found that I can get my Realm down by several megs by doing this and it is good to do if you want to export your Realm for others.
On the Fantasy Grounds forum they have tutorial on doing this along with a link to a free image optimizer.
https://www.fantasygrounds.com/forum...lemap-and-such!