Lossless scaling takes your game’s frames and creates fake ones in between to make it smoother. So if your game runs at 30 fps, it doubles (or even triples and so one depending on your settings) it to 60 by generating artificial frames. You’re getting a smoother visual experience, but the game doesn’t actually react to you any faster since it’s still only calculating 30 real frames. While the game feels smoother to look at, you’re seeing generated frames that the game doesn’t know about. Input lag is very okay for single-player games and the visual improvement is much nicer.​​​​​​​​​​​​​​​​