XPS 8930, internet connection issue

8930 w/killer internet connects but slow. Checked at spectrum speed test barely made it to 300mps. Some pages don't load all the way.Could not get the speed test to load again.Tried diff browsers. I have a inspiron 3880 right next to the 8930.It snaps to over 500mbps. Can do it over and over. The 8930 is getting to be a problem loading pages all the way.Some like you tube open right up and work fine.