So I've recently stepped into the world of BitTorrent, and am floundering a little at the 'ways to increase your download speed' section. Apparently NAT can be quite a problem, and I recently found an option on the Netgear router page (firmware, is it?) to make my NAT filtering 'open' or 'secure'. It's currently set at secure. Should I switch it? Would that significantly increase my download speed, or is port forwarding enough?