How much is a lot, though? There are five in my household, plus an IF, the kids don't have much, but the parents and Simbot have a few things each. I am playing a premade house of one in Monte Vista right now, and that is running fine, and has been going for about ten minutes. I will play that a bit longer to see of if it remains stable. My household that freezes is either second or third generation (can't remember off hand). I will check their inventories and see what I can get rid of. I don't tend to stockpile stuff in there, though.
Thanks!