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I play rhythm games on PC. I use ASIO4ALL to bypass any kind of audio processing being done by my OS to reduce audio latency as much as possible, and I do research before even attempting to buy any monitor. I got a Logitech Z407 for my birthday and even using the audio jack it introduces enough audio lag (~3ms) that I went back to play on wired headphones.
There is no way, you notice 3ms of latency
Probably not, I can't inmediately notice it, but you see, games like Ez2On Reboot: R have a very robust customization suite, including timing adjustment and indicators for when you press a key too early or too late. The game combines both features on a single option where you play a song while the game automatically adjusts the delay between your keystrokes and the "target" you're supposed to be hitting. Using that feature, the game added around 3ms window to my keystrokes, and after a couple of game sessions, you can actually feel the game being slightly off-beat (since those kind of games actually play sounds whenever you press a key, your "play" sounds slightly delayed using the rest of the song being auto played by the PC). Also, the early/late counter at the end of each song increases one way or another. Again, it's not immediately noticeable, but you feel something's off and the results screen can confirm it.
People don't understand that while 3ms is extremely short, in rhythm games people can time the switches of their keys to hit a few ms window by consistently moving the fingers at the same speed
Something you may not be able to see (if you flash something for 3ms it's not guaranteed we can be able to recognize it), but it's a timing you can hit because of practice