You are like the Chinese said, 'A lantern that made of hide, no matter how hard you lit it and it still won't shine'.
Enough of puzzle. :)
I understand you that some bugs are just hard to get rid of. However, everything you have said are just speculations, all the 'could be' means nothing. The FACT is they ignored all the threads that asked for help on the issue for weeks! I, like many others, have not played a decent game since the patch. Everyday I log in to see if anything has improved and I give up in 5 minutes. And yet they keep ignoring our request for help, no acknowledgment, no response. Do you understand how it's like being us?
I see the quality in you, persistence is a good thing. I bet you could do a better job than the customer service of Blizzard.
Sure I would do my best, but I do have to tell you that I would be a little hesitant to post a reply on that forum. Due to the treatment that other blue post and MVP posts have received in the past. That would make me a little leery of posting, but there is a way around it. I would tell Blizz to post a blog on the official website. Telling them it is important to let your players know that you are aware of the problem.
Also, if I did post I would probably ask you and others if you are using any other programs while running D3. Such as Xfire, Skype, Ventrillo, etc... Ones that do not really violate the rules by modifying the game to give you an unfair advantage over others. It could even be giving you problems because you are using the program that just darkens the game to give you that dark look to make it more like what you feel Diablo should be.
I would also ask you what system specs you have, maybe even having you post a dxdiag dump that would. If there is any file in D3 that can also help troubleshoot the problem I would probably need that as well. Further I might want to know what you were doing when the lag started. What class were you using, what skills where you using at the time when the lag started. With as much info as possible, then it might be possible to determine what is causing your lag. Because I know that personally I have not experience the lag you have playing during this patch.
I know that some of the things that I mentioned here might seem like I am reaching for straws. But I am not willing to rule out any possibility no matter how silly it might appear to be. I know from personal experience that sometimes what would seem the most silly is sometimes the answer to the problem.