It’s probably the server lagging, but you can always try the following:
It’s mostly common sense but you might have missed a few.
1. Clearing your cache (WARNING: Will delete all game save files from other games.)
2. Running only FO (Don’t open like eight windows at the same time)
3. Use another browser. I personally dislike IE, but you can always try it or chrome or firefox.
Hope this helps. Might not, since the server is a bit overloaded. They’ll fix up the server sooner or later so this is probably only going to be temporary.