Im having the same issues ((this is not an ordinary lag, when the game freezes, animations, shadows and plumbob are moving while sims and everything else is frozen))
i tried the resetsim multipule times and it doesnt seem to help, ive also reinstalled the entire 10 expansions and stuff packs i have (About a 3/4 hr chores) 3 times in the past 3 days....as i just purchased into the future and island paradise i would like to actually PLAY it. I did notice if i take my sim from the present where the game freezes every 3/5 and stays froze for about 3/5 secs this issue goes away if i take my sim to the future. Once it stopped when i shut the sim radio off but sadly its doing it again and there are no radios allowed on my lots ne more...so please help me i really would like to play my game as i also just purchased a new gaming computer JUST FOR Sims and about 4 other EA games...