Here is an interesting item from Eric Hunsader of Nanex showing the INSTANT reaction of computers to the FOMC announcement. When I say instant … it took 7 milliseconds for Chicago to react. That’s cause of the speed of light slowing things down somewhat (yeah, that’s sarcasm, in case you’re wondering).
Read the text above all the graphs, too – Hunsader asks some pertinent questions.
I posted an interview with a HFTrader a couple of days ago, well worth a read.