WOOW! I had a wery high ping on Argonath Server for some days to, but it's low now! It can be becouse you have such a good internet line, but it can also be that you are downloading music, etc movies! If it nothing of this reasons, i do not really now! But if you sit on a router, that are no Password on, somebody can sit on that router and downloading as hell! Check that out to!
I hope this helps you! =)