...which means it is traded within milliseconds -- before the light from your computer screen reaches your eyes...
Nah man. The average distance between the user's eyes and the screen is 3 feet, and light travels one foot for every nanosecond.
So 3 nanoseconds for the light to get from the screen to your eyes is much shorter than milliseconds. What would be more accurate to say is that the lag time between your brain being able to process the information, and then acting upon it, is the bottleneck, because that takes a whole lotta' milliseconds.