The lag your experience with the camera is mostly likely do to the autofocus/exposure whatever stuff. When I first got my N1, I would "click" the onscreen shutter "button" quickly like it was a hyperlink or something. Instead, you need to hold the onscreen shutter "button" down until you hear a tone and get a yellowish outline around the picture preview area. Then let go of the "button" and the picture will take instantly.

Of course, your mileage may vary. :-)