Well so basically I have 2 problems:
1. Whenever I play my game and alt-tab or go to my second monitor to do something (discord, music, youtube etc.), and go back into the game my game will feel very unsmooth as example I play 180hz but it will feel like scuffed 90hz and I will have it untill I restart my game again.
2. Also, as soon as I go a few FPS below my refreshrate my game feels even more unsmooth then in problem 1, I get input delay, my game starts feeling choppy and I can barely aim/move, on top of that I get micro-stutters all the time as example dropping to 60-120 FPS ingame (fortnite)
What could this be? I don't know how to describe it even more specifically.