Edit: I’m glad so many of you have had no issues with multiple monitors. My set up is a little unusual (3rd display is an infrequently used large tv hooked through the receiver) and is definitely solveable but will take some effort (and honestly, I’d rather spend my spare time outside or with friends, so who knows when I’ll fix it.)
High FPS like 144 is noticeable in specific situations in specific games, mainly those with a lot of panning like fast paced FPS or racing games where things move quickly across the screen while the camera is also turning.