In my case I was wondering if it's because it's been less than 12 hours since it was installed so maybe the guide is still filling up causing it to be slow. But if others are having issues maybe that's not it. Have one other receiver in a bedroom that has the new UI and it's very fast. I did make sure native was off and it was. Fiddled with things to no avail. Mayhaps it's just because it's new. Worth it in the long run getting it at the discounted price.
Another issue while I'm thinking about it. Set up several series recordings to only record "first run." And it's showing that it will record every episode on all of them whether new or not. I notice that shows aren't showing in the guide descriptions as "new" or "repeat." Is it always like that?
Also, I don't have locals yet. Anyone know if you don't have locals if you are able to access network On Demands like NBC On Demand, for example? Can't test for myself as the D* router won't detect my home network for some reason.