From what I understand (and I'm no expert in HFT or electric engineering), this kind of sub-second trading is done in very specific corridors: Chicago-NY, NY-Lo

From what I understand (and I'm no expert in HFT or electric engineering), this kind of sub-second trading is done in very specific corridors: Chicago-NY, NY-London, London-Frankfurt, London-Paris, Paris-Frankfurt. I wonder if the same applies in Asia, with Singapore, HK, Tokyo, Sidney...