This is not fast, as 13ms is only ~75Hz. I'm not sure why they claim that the results are surprising. What's surprising to me is that they had a test setup that supported only 75Hz.
As for Carmack, I belive he has been onboard for even 200Hz displays for qutie some time already.
As for Carmack, I belive he has been onboard for even 200Hz displays for qutie some time already.