I'm having a similar issue. It just started today, yesterday I was able to play with absolutely no problems whatsoever. My mobilobjects.save is at about 2mb and my save files are at about 2mb each as well. Load times are about 30-45 seconds.
Also, I have very low framerates when I finally get into the game, about 20-25 max fps. Again, I was playing just fine yesterday with no framerate issues.
Setup:
i5-4690k
16gb ram
GTX 980
3440x1440 resolution (Tried bumping it down to 1920x1080, but same issues)
Installed on SSD
