Hey. I have this problem where if I open youtube or OBS in the background behind the minecraft window ( mc window full screen ) i get this weird stuttering mouse movement. If i have a video playing in the background, it'll stutter. I have normal fps, but it feels like lag. That's the only way i can describe it. It doesn't REALLY lag, it just feels laggy. This is Technoblade's video. If you watch at 6:13 or there, and look closely you can see he had the same problem. If you can help, please help. thank [ I use 1.8.9 java, and everything is up to date, and my drivers for graphics aswell ]
I have the same problem as you and it seems no one has this kind of problem except you and me. I'm trying to find a solution, but it's not easy. If you have found a solution since, could you please let me know ^^.