I've been playing Sims 3 for quite a while now, I usually play for a bit, then stop and repeat with a new sim, etc. It wasn't until 2 days ago that Sims 3 started lagging after about 10-15 minutes of playing. The lag is quite unbearable. Only 1-2 minutes pass per every real second on ultra speed, which is quite painful when my sim is working or sleeping and some visual parts of the game are lagging but some are not. When my sim is walking, the game is lagging, skipping frames but when he's sleeping, the zzz-s coming out of him are coming out at regular speed, but time is moving on slower than it should.
I've googled about this issue and haven't found a correct fix. I've tried using the Master Controller and resetting everything, which didn't really help. At first I thought that the problem is world-related to Appaloosa Plains, but I've moved my sim to Isla Paradiso and it didn't help. It went nicely for 10 minutes and I was really glad during that time, thinking that it helped, but then it started lagging again.
Does anyone know how to fix this issue? Any help is appreciated.
EDIT: I've been playing with the sim for about 10 hours before the lag actually started.