>Things got even better for us in Korea. Now that I had the bits streaming off one by one, or at least byte by byte, you could see that the packets took a long

>Things got even better for us in Korea. Now that I had the bits streaming off one by one, or at least byte by byte, you could see that the packets took a long time on the wire. Milliseconds. A common technique in network monitoring is slicing, where you just take the first part of the packet. I did this with the HDLC bypass code and we were now a long way ahead of the game as the bid and ask fields were at the front of the quote packets. Save 100 bytes at 128 kbps and you’re 6.1 milliseconds ahead. As specifications changed and KRX feeds sped up, our advantage reduced but life remained good. Now we were sending out orders before the data packet arrived. I love it when HFT seems to violate causality.