Logitech finally figured out how to reduce input lag in wireless keyboards with the new G613 model. It offers 1 ms polling rate through the innovative Lightspeed receiver, as well as increased signal strength. Additional features include the Romer-G switches with 1.5 mm actuation distance, a palm rest and 18 months operation time on two AA batteries.
https://www.notebookcheck.net/Logitech-outs-the-G613-wireless-mechanical-keyboard-with-low-input-lag.246280.0.html