Peter Hucker wrote:

What isn't being into consideration is the time it takes to process/buffer
digital video signals. This is even more problematic on a DVR since you are,
in effect, viewing a recorded/delayed signal.

It can do all that decoding, but can't repsond to a keypress in a timely manner?

And you know it isn't responding...how? Giving you the channel/video signal
you desired is only the end result of its response.