Cory Lewis is the fastest I've seen. He has a 2 second preshot routine. Joe Bausch and Kyle Harris are dawdlers. Their preshot routines are 3.4 seconds each. Last time I played with them, the three of them dragged me along (it was good for me) for the first 9 holes in 1 hr and 10 minutes (IIRC), all of us walking, before we hit traffic on the back 9.