1080i has the frame rate Tom mentioned. 29.7. The rest of them, I don't know.
I assume he was speaking about GOP structure; how many in the GOP. The frame rate of 1080i is actually 29.97, which is a legacy holdover from NTSC in 1953; they lowered it from 30 to make it a submultiple of the 3.58 MHz chroma subcarrier that was tacked on when they added color. Still with us 60 years later, and was here decades before the concept of GOP was even a gleam in some Engineer's eye.
720p is 59.94 for that same reason. One wonders if this means more I frames in 720p per second than in 1080i, because if they have the same GOP structure, then twice as many GOPs stream through in the same amount of time. Of couse even if there were, it could also mean they still only add 1 per second to speed up acquisition, which would tend to level any differences out.
The thing is this: you do what you are capable of, and you don't do what you're not capable of. DTV Engineers, and I use the term lightly, are absolutely incapable of designing in the speed that DISH Engineers seem to have perfected, which is pretty maddening, because there are still enough arguments to make DTV a better choice, in the opinion of many. Even if they knew the secret sauce recipe, it is likely that the legacy design of the DVR+ can't really be changed all that much and they have effectively painted themselves into a corner.
Of course I still contend that much of the sluggishness comes from piling on bloatware crap-apps that are of questionable value and potentially a threat to speed and stability. Rip out those "features" that I never wanted nor asked for, and give me a basic DVR that performs at a reasonable snappiness with reasonable reliability (that last issue the problem DISH Engineers seem to have trouble with).
Edited by TomCat, 26 January 2013 - 06:09 PM.