Sometimes it's fast. Sometimes it's slow. It usually takes several seconds for the guide (or any screen) to come up. Navigating once a screen is up is usually snappy. I'm sure this has nothing to do with the UI update, but the remote for both of my receivers seems to be weaker. I have to be pointed right at the receiver for it to respond. Even then, sometimes it does not respond. I have new batteries in both remotes. I have an HR20 and HR21.