Holy fuck that is fast... I can barely even read the letters before the timer goes off. Then I need to find the letter on my keyboard *and* press it... But maybe that's just because I play visual novels and not games that actually require reaction speed...
EDIT: Well, it seems the sequence is the same every time so I can just store it in short term memory, and press the keys before my eyes even register the letters, which is far easier for me.