First you'd have to see the problem.
I wouldn't think you could prove it in the manner you suggest since the units do respond with varying slower or faster than expected responses at most any time.
I did go there for 60 seconds and watched the lower part of the screen and the message about clearing the ram did not come up. I then did the button presses and it did come up.
However, I don't have problems with my receivers and so I don't see a difference. I do reset my receivers at least once per month also.
When I used to see it, it would mostly show up paging through the guide.
The HR21 would be slower than "normal" and clearing the NVRAM most of the time resolved it.
If I were to have a WAG about this, it would be that channel one acts a bit like starting a PC in the safe mode.
For the DVR to be able to clear the NVRAM, it seems it stops a lot of the processes running, which may be why it then speeds back up.