I always wondered how fast it takes the CME matching engine to take up by order via IB. Now I know. I hit a bid (emini S&P) in a slow moving market and it seemed that right after I hit transmit, I saw my trade scrolling across the quote.com livecharts. I was in shock. I wrote down the time and looked at my fill report and that was my order. It seemed to be in the order to 100 to 200 milliseconds.