I don't have an LCD or plasma (it's a Mits DLP) and we normally watch TV in a room with very low light--and none between the couch and TV--or in natural daylight (overhead lights used very infrequently). I tried enabling 30-second skip via the above directions, even though I was quite skeptical how it could help, but it did absolutely nothing.
A restart seems to help, briefly, and the unit seems to respond faster and more accurately when not recording anything, but it's still slower than my other HD DVRs--and not just slightly, but abnormally sluggish. (The lights on the front blink when I push the remote--so it is getting the signal, just not responding, or responding very slowly.)
If anyone has any other suggestions about how to remedy this, I'd love to hear them.