[nkrisc]

I think this sort of effect odd what makes people think they can tell the difference - they can notice the indirect side-effects that correlate with the difference.

A pro FPS player might notice that they loose contests peeking around corners more often. Obviously network latency in online games will be a factor as well, but since it likely averages out for both players over time, I would guess you can mostly discount it along with alternating who’s doing the peeking.

I don’t think anyone could look at a scene on a 120hz vs 240hz display and tell the difference, there needs to be some indirect clue.

[sjoedev]

I play video games at a decently high level (like top ~10% in a few competitive games). To support what you’re saying, I can tell the difference between 144hz and 240hz if I’m in control. For example, if I can shake the screen around.

If I’m just watching, I’m not sure I could even tell the difference between 60hz and 144hz.

[tverbeure]

esports games are played with vsync disabled, which means you'll get tearing when there's a rendered frame update in the middle of a scan. At 60Hz, you'd definitely see the tear, at 144Hz much less. So that would be a way to notice the difference as a third party observer.