The thing is, I have never had one of my receivers to do the things you and others list.
I don't think 99% of DirecTV customers have this problem. If they were, these forums would be blowing up. However, DirecTV has known about the problem for months and hasn't fixed it. From what I've read, they also don't want to exchange receivers because they're working on the problem. Mine was fine until 0x066a.
I did some timings today on the usual problem areas:
2:20 and 2:02 for Quicktune (up arrow)
0:25 and 0:29 to tune the channel when the Quicktune icons finally appeared
2:00 Previous channel
1:59 Info, then More Info
1:35 Menu, then arrow to Search & Browse (Extras also has a long delay at times)
I removed my CCK and DECAs over a week ago, with no improvement. Everything (HR20, HR21, HR24) are connected directly to Ethernet. It's bad when your HR20 and HR21 are your fast receivers.
I don't know if DTV is monitoring, but following LIQUICE' example, I'm sending report ID #20130602-2CBD. I was requested to send a report several weeks ago, but nothing apparently came of it.