So You Internet is really slow?
Checked your wifi connection?
Checked your broadband throttling?
going at less than the speed of dial up?
First of all in norton 360 Temperally disable the smart firewall then do a live update restart you computer then you will have a firewall difintions update.
This fixs issues that make the firewall block inocent traffic.
Annother Symtom may be that some apps/programes download content faster than your browser.
Version 360 v6 to 20,2