a vpn as far as I know whould only be used by the cyberpolice. I've only known one person who said once to me he was using a vpn, a young kid 32, friend of my daughter's, who visited me once for 3 months, he was downloading torrents i.e. films, and sometimes exe's, this is illegal, you knoiw, copyright material. I told him about it, and how it's not allowd, you shouldnt be downloading anything except books, and freeware opensource programs. We've got youtube will billions of videos on, just watch stuff on there. I know kids do it now, this downloading of mpeg files, games etc, but you are not allowed, so I am not surprised norton is slowing things down if you have set up a vpn, it will take all the speed as norton will think you are a detective on a special investigation needing also security as well as covering up everywhere you go. Turn it off.
I can't see any mention of vpn anywhere in the bt program, it just says Norton at the left, BT at the right, is says Nortonlifelock, don't click on any extra buttons, just download it and leave it as it is. Just as in a spaceship, you should never touch buttons you don't know. I have just downloaded it and let it run, I haven't clicked on anything extra.