Delayed Actions

Hey, I don't know if this will help anyone else but it certainly helped my game!

Check your sims (all sims in the household) inventories. 

I noticed that one of my families experienced this lag while others didn't.

I built a smaller house, cleaned all my caches, downgraded the graphics and nothing worked.

Then when I was trying to transfer fruit from my sims inventory to the fridge, I noticed some serious lag. My main sim in the laggy household was an expert gardener and had racked up over 200 of each kind of crop you can grow. 

I decided to cut all the crops she owned down to 10 and my game was like brand new!

If you have a lot of junk in your sims inventories, fridge, or anywhere else you store objects, try cleaning them out!