Hi. So I have every expansion up to and including Island Paradise installed for TS3, but not Into the Future, and not stuff packs and the only DLC I have is Riverview. 

Before installing Island Paradise, my game ran just fine. Very few problems, however now, it doesn't even function properly. The lag is so terrible. It moves, at best, a few frames a minute, and it's literally unplayable because the cursor will not work due to the lag.

What happened? Can someone please help me out here? Is there a way to fix this?