The Sims 3 freezes fix

• The Sims 3 freezes when playing. Especially when you play Isla Paradiso.
  Why you ask. Well simulation is the answer.
  
  All households who are around you need to be stimulated. You say to your Sim to cook. But the computer must simulate all computer played Sims households around you to do things.
• Computer do your sims stuff: takes 100 milliseconds.
  Computer do Scott family (4 sims) stuff: takes 4*100 milliseconds.
  Computer do Mark family (4 sims) stuff: takes 4*100 milliseconds.
  ... On Isla Paradiso are about 20 (4 sims) families living on the island that must be simulated. 20*4*100=8000 milliseconds. THATS 8 SECONDS.
• The solution. Go to "Change city" and wrecks (move out) all families in the city. Let shops and other facilities remain. You will still be visited by Sims even if no one else but you live in the city.