I have figured out yesterday that the Prioritization Engine in killer software was causing the issue. I had to disable it completely. Looks like this feature is buggy on Windows 11.
Hi,  Since I have upgraded to Win11 (Win10 was unaffected) my network connection to Facebook, google (maps mainly), YouTube is barely usable. Facebook- Site loads, kind of, well mostly it loads the page in a minute but then it's dead. During the network tab examination, their servers take more than a minute to respond, I cannot even post a comment. Google Maps- It takes forever to load the map YouTube- I can't stream higher resolution than 480p (I have >200Mb/s network connection according to speedtest.net)- Netflix works just fine Other devices in our home are not affected with this issue, only my XPS 15 7590 running win11 (win10 was totally fine). According to support assist, all my drivers are up to date. I have tried to use my mobile hotspot to double check if it's not issue with the internet provider or the router but it isn't.    Any help is appreciated. Thank you!  
XPS 15 7590 - Windows 11 - Network issues to google services, facebook and 
youtube, rest of the internet is fine 🤷‍♂️