This thread's arguments' claims that the home button delay is noticeable or not noticeable reminds me of "the dress": Some can see certain colors, and some can't. It's only until someone opens your eyes to the color you can't see that you do see it. Or Magic Eye paintings...
The only reason the home button lag isn't "there" for some is because you just can't perceive it: and that's okay. Those than can see it (including me) aren't wrong... and those of you that can't see it aren't "wrong", just incapable of noticing. (and count yourself blessed that little things don't bother you
)
I notice little things, and they drive me nuts. (vertical grey lines on iphone screens, animation stutters if they exist, super super super tiny scratches on screens, scratches on aluminum, etc.)
Now lets all press our home buttons three times in solidarity.