input lag

For roughly 4 months I have been experiencing some input lag from mouse and keyboard in Warzone. Nothing about my setup has changed since the input lag has started. I get it on both the mouse when firing, and ADS'ing, not when I am looking around only on the mouse clicks and on the keyboard when...

Hey! I need to buy a fiber optic HDMI cable at 6 meters in order to use my pc with my 4k tv and a controller for gaming. I'm a bit concerned about possible input lag though, as the signal is converted to light in the cable and then back again. What do you guys think? Do i risk increasing input...