Everything about latency. Tips, testing methods, mouse lag, display lag, game engine lag, network lag, whole input lag chain, VSYNC OFF vs VSYNC ON, and more! Input Lag Articles on Blur Busters.
I also would love to see BattleNonSense re-test that specific part of the video. If I remember correctly he back then assumed it was a driver issue, but who knows if Nvidia cared to fix it?
Acer XF250Q, R6 competitive player