I have the same problem with my game, after I installed The sims 3 Pets (I got it on the release day) my game started to freeze when I've played for about one or two hours and the "not responding - sign" comes up. I have all the expansion packs and all the stuff packs except for Diesel. My computer is not old and it is…
Have you done Hermione's house? :) I have done her and the Dursley's houses and I'm thinking of uploading them to the exchange. If you haven't done Hermione's, feel free to download mine :D Btw, your work is truly amazing! I am stunned :)
I also have a problem with my game. I'm pretty sure it started right after I installed Showtime Katy Perry's edition because when I uninstalled it, everything worked perfectly fine. The problem is that when I've played for about an hour, the game freezes and the "not responding" sign comes up. I don't have any mods at all…