littearly, i don't know why, but my computer lags while rendering vegetation and buildings, and the framerate drops from 45 fps to 3 fps the computer (or laptop) specs are: -AMD Ryzen 7 3750h with radeon vega graphics -NVidia GeForce RTX 2080 -512GB SSD -16 (or 15.4GB as the system thinks) GB of DDR3 (i think) memory.
This sometimes happens to me but it isn't a persistent problem so I wouldn't worry about your specs; it's probably just the game.
