————–[2D +DSP Meter]————–
The DSP meter in the Box Info Pane is sort of an oversight for legacy boxes. What it is showing on legacy boxes is the DSP load of the primary transport and mix engine DSP. You have no control over that number — it is a characteristic of the Firmware and the sample rate (as well as the state of firewire transport — it goes up when audio is being streamed to and from the box). Basically, if you are on aa legacy box, you should just ignore that number in the current version of MIO Console. (5.2)
The DSP meter in the +DSP pane is the one that gives you the actual DSP load due to the plugins you have instantiated. On 2d Expanded boxes, the DSP load for the 2d Card is displayed in the Box Info Pane — and that is reflective of the mixer and plugin configuration that you have created.