Speed of Thought
M16 rifle = 2,180mph
Speed of sound = 768mph
Speed of light = 670,615,200mph (186,282 miles per second)
Speed of thought* = between 23 and 268mph. Which may seem kinda slow in comparison, but bear in mind it doesn't have to travel very far.
*By which I mean the speed of action potentials in the myelinated neurons of the human brain, if you want to get technical.