Ugh. I restarted my computer, but my game is acting exactly the same. In fact, I think it's even worse. I'm really thinking of giving up on the sims now. Please, someone help!
There's several things i can think of that can cause slowdown. Are you willing to go through some troubleshooting?.
1) What patches do you have? (as in, what patch do you have of the base game and each expansion)
2) Does it happen with brand new neighborhood & sims?
3) What custom content do you have?
Mismatched patches can cause a lot of trouble (can happen if you patch manually or if the EADM did what it does best and failed to do it's job).
#2 would be a clear indicator of either bloated world cache or glitchy neighborhood.
#3 is the wildcard here, if you go through CC fast, deleting the caches would help, if you use a lot of little packages, merging them would greatly improve load times; If there's a bad apple amongst your mods, that one could be the cause. Ironically enough, the right mods can greatly alleviate neighborhood decay.