I'm intrigued. Do the last 2 guys really don't get any lag or they are just not noticing it?
It is not a lag, it's a stutter. Like a motion blur is missing there. It's more noticeable when you are inside houses (when the 3D is disabled) and when you walk instead of run. All the image behind the main character seems to "shake" more than it should. It is not SHAKING ALL OVER THE PLACE, it's subtle, but noticeable.
I'm in the search for someone who can notice this on their R4 and owns the original thing, to check if this is really the way it's supposed to be so I can calm down and enjoy.
I don't know about the R4, but I just tested it through at my DS-X 4Gb, and I couldn't find any kind of stutter/lag at all, no matter how hard I tried.