I bought some new pc parts this fall and I played Battlefield 1 with 58-61 fps. After Christmas I noticed some lag so I looked into it with msi afterburner. I found out that my GPU usage wasn't stable and it was dropping from 98%-100% to 0%-30% causing fps drop. I have completely uninstall using display driver uninstaller and reinstall the GPU drivers and I have try previous drivers too. I also had my pc checked for malware . I haven't many programs running in the background or I haven't install any demanding program since I bought the game either . My specs are Radeon RX480 Gaming 4GB, AMD 4300 Quad Core , 8GB RAM ,BIOSTAR A960d +v2 ,Windows 10. I know that my CPU isn't that great but at first the game was running without any problems . Here is a picture of my GPU usage while I was playing .