Let me give you an example that might explain you my question:
When Im watching 60fps videos of people playing CoD Ghosts it really looks very smooth, but when I play it on my PC it looks like 30fps?
I have FPS counter active and it shows me that I have 60+ fps but it just doesnt look so smooth like videos of other people playing.
I know this question is a bit weird but I was always wondering and couldnt find an answer.