Internet issue without internet issues

Battlefield 6 is my first ever battlefield so I didnt know what to expect. In my first games everything went into slowmotion every couple of seconds which I combated by inputting a cnfg file to make battlefield use all my cores of my cpu instead of only 3 of 8 which made things better, I also started running it in admin mode which helped even further but I STILL get the slowmotion which is incredibly frustrating. I turned on my network graphs and apparently its connected to my network, I am on wifi but I never had any lags in ANY other EA game and even doing speed tests during the game it said my internet connection was perfectly fine, Battlefield didnt agree. I was afk during the first hours in the menu so I cant even get a refund now but the game is unplayable I dont know what to do. At this point Im just upset because it really shouldnt be lagging. Does anyone know how to help? because I really wanna play but I dont know what more to do. I also ran cmd; "ipconfig /flushdns" already which didnt help. I just wanna play😭