I have chronographs my bow from as close as I can get to the riser (about 3") out to 80 yards in 1 yard increments and I can tell you that there is no faster speed than when the arrow first comes off of the string. After that it averaged a .5 or so fps loss in speed per yard down range. Speed loss is dependant on the drag coefficient for that particular arrow configuration, and largely depends on arrow diameter, vane or feather type and number of vanes or feathers.
The paradox is another thing though. Would expect that at some point , likely 5 or so yards, maybe further you would see your maximum penetration due to arrow recovery from paradox.
That being said I have shot elk at 4 yards and never had a penetration problem.
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