Fortnite feels smooth with 240 fps?

But if you have a 60hz monitor, it still feels so good?

Then it feels like 60 FPS.

Of course not. After all, you only have a quarter of images that are shown every second.

If you have a 60Hz monitor, it only displays 60 FPS. Even if your PC produces 240fps, the screen displays only every 4th image, and then 60fps.
Greeting