Immensely slow UI (and boot up)

I have a new TiVo Premiere XL and find the HD UI to be immensely slow -- on the border of being unusable. I could see it being this slow if network access were required, but it would have to be network access for every single display element -- not just the preview bar. That clearly can't be the case, if only because in principle the machine is usable with only a phone connection. And a network access shouldn't be necessary to scroll the "My Shows" list (at least 4 seconds on a 38% full XL)....

Immensely slow UI (and boot up)

Immensely slow UI (and boot up)