Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - Technical Issues Low FPS on high end hardware?

I was playing OS very often on my previous graphics card which was a GeForce GTX770, and I remember that it was running smooth.

Now, a year later, I decided to continue with my savegame in the original version (Not enhanced) and I notice that I can barely get over 30 fps. I looked on the forums and on the OS reddit, but I can't find any solution.

I have a GeForce GTX1080, AMD FX 8 core CPU and 8 GB RAM. I have the latest NVidia drivers and Windows Update is on (but I don't have the Anniversary update). Anyone has any suggestions?