I don't fully understand what you are saying.
Supernatural is an expansion pack and cannot be played standalone. So if you play the game, you play both the base game and supernatural.
Are you saying, that the game works fine in a supernatural savegame but not in an older one you've played before you hade SN ?
Here's some more tips on lagging: http://answers.ea.com/t5/The-Sims-3/FAQ-Lags-amp-Freezes/td-p/646
Yes, the game works fine when I play in the Supernatural, but not when I play my original game. I cannot even move my Sims to the library to relocate them to the Supernatural town. I have tried the cheat codes for a reset, and I have looked for stuck cars, extra Sims etc. I will check the link you posted to see if there is something on there that I have not done.
Thank you.
If it's just one savegame, it's bound to be something about that game.
What city are you playing with your Original game ?
