Re: Sims 4 suddenly became slow!
Could be, do you have both the 32-bit and 64-bit set up for the GeForce card?
You could also test if the game runs better without CC and a clean folder. You can do that by renaming The Sims 4 folder in Documents. The game will create a new, clean one, test the game on that. If it runs better we know it has to do with something in the old folder. If it doesn't run better you can rename the old folder back to the original name.