Gameplay is not smooth

@7empePL @Sick1Click thanks for helping, I replied but apparently it disappeared. So: i tried every solution from @Sick1Click but I honestly can't see the difference, the issue is still there. I will definetely try 60 fps configuration later today, but it's still weird how the game was running perfecly some days ago at 144 fps (it's still running at 144 fps). I'm starting to think that it could be a connection issue. I played so much as i could these days, and I figured out that sometimes the game runs smooth (with some sort of microstutters) but sometimes it just lags. I can't figure out if it's 'graphic' lag (cause the stats are good) or a connection problem. The thing is, my connection is not bad (8 ms ping (in game 40-70), 55 mbps dwld and 20 mbps upload). I tried to disconnect every device connected but it doesn't change nothing. So yeah, i don't really know what to try anymore.