Hello I think the problem is not in the graphics card because other games like: Witcher 3, AC Odyssey, Red Dead Redemption 2, runs good without sluttering and fps drops. I not use windows xp and windows 7 compatibility. I will try. Best regards.

I started playing in act 5 and I have the problem. Spriggans, trolls, and troll wolfriders are broken. Killing even a single one can cause my computer to start skipping frames and lagging for 10-15 seconds. This is a real issue. It's inconsistent though, sometimes it's much worse than others, but it's always a problem when they die. The game run bad when it rains and fog, and when the weather is snowy. I do not know what to do. Everything was fine and the game run pretty good until act 5 started. There is a solution to this problem? This happens on dx9 and dx11.
I have Gtx 970 Msi Gaming 4gb, i7 4770, 16GB memory and SSD disk. Please help and best regards.