I pay for 28Mbps down, but the reality is that I get anywhere between that and around 55 Mbps (which is good).
I realize that I can set the router to 100Mbps down or manually enter 55Mbps, but then that would throw off the router's QoS calculations - depending on what the (actual) download speed would be at any point in time.
You know what I'd really like to know - is that apart from the user settings - for D-Link (and all manufacturers for that matter) - to publish a white paper that describes how they set their devices up to work. That would enable the user to fully understand the capabilities (and expected behavior) of the various features and functions of the device.
I must admit, until I saw your tutorial on the QoS settings for these newer models, I was a bit disappointed that D-Link themselves did not provide as good of an explanation of how to configure QoS (properly).
Thank goodness for the resources available on this forum that help everyone figure it all out.