This expansion is known to cause exponentially more memory use, and substantially more memory leaks when combined with The Sims 3: University Life expansion.
It is also known to generally reduce performance using these two expansions together.
This is likely to do with the fact that these two expansions each drastically increases in world maximum populations and the metadata included with each Sim character. There is likely a fix in the GraphicsRules.sgr to reduce the world population overriding the default that is based solely on processor time, not memory. It is rather high on any modern system.
Additionally, on modern systems turning off the game's script-engine multi-threading can reduce some hiccups in the game.
I will provide a howto in tips and tricks section if people show interest.