I like to use live preview mostly but when I use the viewfinder, the shutter clicks considerably faster. I think is has something to do with the SLR technology, not just settings. Why slow performance in live preview?
EDIT: I am aware of the slower auto-focus in live-preview but even in manual focus mode, there is a considerable difference in operation. Feels like the shutter takes longer to "start taking the photo".
PS: I've a Nikon D5100.