I use Atari 2600, Atari 800 and Commodore 64 cores frequently. I am very sensitive to input lag.
I current own a 2600-daptor so I can use original Atari joysticks: https://www.2600-daptor.com/
I was thinking of getting a Daemonbite Atari adapter (unfortunately sold out) which has very low lag. I was wondering, is this even worth it? Its not expensive, but I cant find any actual data on the 2600-daptor regarding lag. I know Daemonbite is 0.75 or so. Was really curious what the 2600-daptor is.