Sims 4 huge fps drop and lag after introducing the last event

puzzlezaddict​  just an UPD: i repaired the game, it didnt help. I also checked that Nahimic was very outdated so i updated the drivers, still exited it via Task Manager, the lag is still there and it starts almost the moment i enter live mode. 

I am very confused how it worked for the first time, and now all those steps do not help. I kept the mods folder exactly the same as when I tested it successfully for the first time (only MCCC + some CC hair, default skin and eyes).