I was trying to play COD: World at War when it suddenly decided to process vulkan shaders one day. I didn't think much of it, so I let it download them. But then when I played it, the right joystick was jittery and weird. The game was running at a solid 60fps, but looking around wasn't smooth. The problem persisted until I decided to disable the framerate cap, and now it runs at 90 fps and looking around is much smoother. I don't understand why this happened though.