game lagging after installing new pack

hi, my game has always run smoothly on my current computer, never had any problems with it even on full graphics, loading screens taking about 10 seconds and game start up super fast.

today i got life and death, and its started to be a bit slow, it lags most when entering/exiting build mode from live mode, it also lags on 64x64 lots in build mode when the grid is on and when changing from one sim to another in live mode. it also freezes for a second or two when travelling and loading the new lot.

i do use cc, but not any script/gameplay mods

im also on pc