You have to keep in mind that the mentioned sub-microseconds are the _reaction time_. HFT can't beat the speed of light either. Therefore if your orders are syn

You have to keep in mind that the mentioned sub-microseconds are the _reaction time_. HFT can't beat the speed of light either. Therefore if your orders are synchronized to better than the speed of light distance to the next exchange, HFT traders won't be able to profit off them (-> you have milliseconds). With GPS receivers or very good network connectivity to your ntp server (ie. not home dsl) you can easily get down to below 1ms.