Xuks1

Hello, I have a huge problem, when I’m hexxit is fluid most of the time, but when I’m turning my head in game it’s lagging a lot, even though I have at least 80 fps. I installed Optifine but there is no difference. I’m playing on a server with a friend but it’s not lagging for him. I even reinstalled the pack. What can I do? Sincerely, Xuks1