Perhaps you need to read up on the meaning of lag. It has nothing to do with your connection type. Someone on cable can be lagged all the way to hell and back at the same time someone on a 28k8 is only lagging 1 second. Lag is the time needed for a signal you send out to arrive on the other end. It depends on your ISP, the condition of the server you are connected to and other things beyond your control. You can very much test it yourself.

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I hear and I forget. I see and I remember. I do and I understand. -Confucius