I have horrible lag but it occurs on somewhat of a monthly/bimonthly basis. Some months I play fine others I don't. I have Comcast as an ISP and up to 12mbps download and 5-6mbps upload. I've tested it and I get 6mbps upload and 4mbps download which is decently fast. I've tried QoS and my NAT is open and it stil lags like crazy. Also my router lets me do "safe mode" in which only pre-approved MAC addresses are allowed in regardless of whether or not you have the right WPA2-PSK [AES] passphrase.