60hz vs 120hz isn't technically more input lag inducing but when you pair it with vsync it does imho. So, 60hz refreshes every 16.7mhz and 120hz every 8.3ms. With vsync enabled, there is a frame buffer so frames can be sent in sync with the displays refresh. Since the frame durations are twice as long on 60hz vs 120hz, the accumulative frame buffer lag from vsync is twice as long (regardless of how many frames are buffered in the vsync used). When i made those videos, i did some more tests in my own time and found vsync at 120hz for competitive gameplay was a perfectly reasonable compromise between (barely any) input lag vs the benefit of no screen tearing and frame smoothness. At 60hz's the input lag was noticeable. However i had never checked before then and was non the wiser until i had purchased a 120hz monitor and done a comparison (with the same display) for myself. I use adapted vsync in rf2, best compromise for when the fps does dip below 120fps from time to time.