It could just be that your file is taking a long time to load because it is a large file. Does this happen on newer saves? If not, it's likely just that your file is large and that it needs a long time to load. Pulling out content is dangerous on files this large as then the game will have to think even harder about replacing the objects you got rid of.
Some forum members have talked about longer loading times, especially on larger files. If you were to just leave it up indefinitely, I wonder if it would eventually come through after about 20 or 30 minutes.
Another thing to note is, does your game stop responding when it loads? Because that's a completely different problem. I've had games that were loading, and it would just seem to stop, and when I would go to move my mouse and click on things it would pop up the message "The Sims 3 has stopped responding" and close out. If that's the situation, we may be looking at a more dangerous glitch.