Having immediate lag spikes as soon as I create my settlement

I have same problem but I don’t now why.
My system :
AMD Ryzen 7 2700X
Manli geforce gtx 1080
8gb corsair vegance lpx
128gb M.2 ssd + 1tb Seagate baracuda

I have got the game also like 1-2 year/s ago. And never had a problem with the game. On my old pc I only had 15 Fps but that was a problem from my old pc. Yesterday I went in the game and it start to lag but I had like 80 - 120 Fps. I can’t see a problem with my Hardware and my card drivers are at the latest version. I play with high graphics and 64 bit. But I also tried low graphics or 32bit but it don’t change something. My game is on the newest version.