Can't say I've noticed any performance issues either at work or at home, but I'm in the UK so maybe we have higher ISP performance? Could this be a local issue in your territory?
The Symantec logins expire after about a week, but you will also find that if you login on another machine, this cancels your login token on any previous machine, or at least that's what I've found. That's down to Symantec re-using some ancient piece of login technology instead of writing something fit for purpose.