For casual gamers like me the difference of input lag between two joysticks are negligible. But to my friends who played Tekken seriously for tournaments they said that a slight additional delay from a USB adapter is a big deal because they add up when using an HDTV.
Although at 1:21 I can hear a slight delay from USB adapter compared to a native USB joystick but at 1:57 I can’t see any difference that’s why I have to use my ears. The input lag of the adapter is smaller than most HDTV. The reason why I bought a native USB joystick because my USB adapter is not compatible with the PS4 system that when I played Tekken 7 the character keeps punching or kicking even I didn’t press anything.
Note at the beginning of the video you see a red LED from the PS2 joystick. That’s the analog mode which I have to turn on because if the analog mode is off my USB adapter interpret the joystick as “left analog stick” instead of D-pad and the lag from the PS3’s XMB is twice as much although it doesn’t affect the game play. Not all USB adapter have this issue, though. I discovered this issue because of Tekken Tag Tournament 2 that if I turn off the analog mode you can’t move.