http://s1068.photobucket.com/user/harryb491/library/
I was playing the first hole of Oakmont when I noticed that the dots were moving at two distinctly different speeds. I took a video of the phenomenon and posted it at the above site.
I used a stopwatch to time the dots and noted that it took 1.83 seconds to travel across 1 grid when they were moving slow. It took 3.81 seconds when they were moving fast.
Harry