tomb933, as I've posted earlier, I have had this problem. But all is well now, but I will remember to try the cable reset as well as a power cycle. I did not do anything other than a cycle of power. My 2nd DVR had no problem when this 1st one was have issues, so COX implied there could be a box problem or like you said, resetting the line.....have not moved these lines in a long time so how they um-tighten is beyond me.
As to my times....when good, using a single up/down on the guide is a second or less....almost like a scroll. Using the page up/down, it takes about 1-2sec or less to populate the 2 lines of missing entries. When I was having problems, it would stay there for 5-10sec or more, then quickly catch up. Another user has a thread about the guide not even changing at all....got to be the box.