https://github.com/MickGyver/DaemonBite-Retro-Controllers-US...
It's how to build your own demon bite adapters using Arduino, for various console. These are super low lag.
If you Google demon bite you can find various sites selling premade adapters.
These are really popular with mister fpga users:
https://en.m.wikipedia.org/wiki/MiSTer
This is a bit of a rabbit hole, the mister is the best retro related thing I've bought / built.
Here's a useful listing of various usb adapters and their latency:
https://rpubs.com/misteraddons/inputlatency