Hello....
Starting my Mac (Big Sur 11.1) everything works fine.
Secure VPN is coming up and I can establish VPN connection.
Using Safari sometimes I get a good connection to the visited Websites. But suddenly when changing site content or to another site it needs either very very long for a connection update or the connection doesn't come up.
Switching VPN off - mostly the same connection comes up immediately.
It looks like the connected server has problems with the safari connection using activated Norton Secure VPN.
Inside my network I have also iPad (with Norton VPN) and some Windows 10 PCs (also Secure VPN active / Firefox).
These systems didn't ever show these effect of "slowing down" or "endless waiting".....
I saw these effect also by previous OSx-Versions - and it was always boring using my Mac together with activated Secure VPN!!!
So being Hard-/Software-Development engineer myself, I am sure, this must be a problem of Safari (or OSx) working together with Secure VPN.
Every software (Norton and OSx) is up to date - and reinstallation of Secure VPN doesn't solve the issue.
Regards
JoBu