Game crashing because the house is too big/has too many items?

So, I have this house on (house73). It's a really big house. It worths around 1,5 million. It has many custom itens that I've already installed. The constructed area goes well beyond the boundaries of the lot (something "that move_objects on" should in theory fix). Every time I try to play this house, the game crashes. I think it's because ithe file is too big, at 1,01 MB. Does it make sense?

For the record, it used to work for literally decades on The Sims Complete Colection, but it doesn't work on Legacy.