Since the TiVo improvements I have found the whole system much slower. When trying to watch a programme I've recorded it takes ages to load then delete when watched. Then ages to go back to live television. It's also recording programmes I haven't wanted to record ( I've checked the recording settings) and not recorded programmes I've wanted recording. I know of three other people that are having the same problem.
Mine has been quite slow for a long time but since the upgrade has got a lot worst. As you say moving between any of the functions it is extremely slow and even loading favourites by any route takes ages to load. This is really a major farce as the upgrade has introduced a plethora of different issues to different users. Technically and price wise VM is becoming a joke.