I’ve had this problem for a long time and I couldn’t find a solution. Games and videos will stutter whenever I use multiple screens. This problem happens on all DEs, on other distros, regardless of compositor, regardless of the game being fullscreen or windowed, regardless of resolutions or refresh rates. I use the nvidia proprietary drivers on my gtx 1070. On particularly bad example is Dark Souls 2: SotfS, with proton and steam. It will stutter at regular intervals, even the mouse cursor will stutter anywhere on screens. The problem only goes away when I go back to only one screen. Is it the drivers? Or X? Of course I can’t simply switch from one screen to multiple or vice versa easily as XFCE gets confused and buggy. I also tried multiple separate X screens.
So I have some questions: Would it work better with an AMD card? Am I a rare breed that like multiple screens? Has anybody else delved into this problem?