You and a small handful of people are convinced that the HD guide kiboshed just about everything speed wise. Yet thousands of others here aren't of the same opinion. Perhaps something else is tinting your glasses??
Who's "You"? I think it did us more harm than good. When it's finally fixed, and I'm sure it will be, it will be nice to go back to the same speed we had with the SD Guide. I don't think it slowed down any of my HRs as far as watching programs, but when you get to certain spots, like deleting 100 episodes, it does take much longer than the SD Guide did. I get to my Setting easily on every one of my HRs. I don't channel surf because I rarely watch live TV, so I don't care how long it takes to change channels.
What we have in this thread is a failure to communicate. For instance, which part of your DVR experience is actually "slow"? I don't see any slowness in any of my HRs when using them to view content. The only real slowness I see is what I mentioned above.