If this is legit, what amazes me is the time! Network hops can account for approx 100microseconds, which means that these HFT trades would not only have to be in the same datacenter, but within no more than 2-3 hops of the exchange device. Then on top of that, it&#x27;s making its trade decision within 500 microseconds.<p>I need to sit down to calculate this, but that is guaranteed to mean that they are reading from RAM and not disk. Could the entire stock market fit in a single hashmap in memory?<p>That&#x27;s just some awesome hardware and super efficient software.<p>Edit:typos