I've had some more time with the monitor and can say the biggest difference is to first person shooters.
Take overwatch for example, playing as tracer, you blink around very fast, often turning your mouse very fast too, to compensate for leaping ahead large distances in an instant, past enemies (to confuse/dodge them). With 240hz, you don't have to wait around as long for the screen image to clear up before you plan your next move or are able to track their new position relative to you. It's more fluid, you can see enemies clearer as you turn the mouse because it's just refreshing that fast, you can actually keep track.
On 60hz, you'd actually have to wait for the image to clear up. It's a pause in your gameplay (you may not even notice you are pausing because you've been so used to doing it - I noticed it myself when I switched back to 60 to see, I realised I was waiting for the image to clear up longer than I would at 240). Or worse, you fire at a blur of their location without waiting and are wasting more time (unless you get lucky).
It's all in the fractions of a second but with fast paced fps games, that can have a big difference and give you a pretty decent advantage - you don't have to stay still at all. 144hz, you can see more and can approximate locations better, less pausing. At 240hz it becomes even clearer while swinging the mouse around, even less pausing and an easier time tracking. It's not perfect clarity at 240, there's still some blur, but it's a decent amount less (if you're playing something very fast). Just gives you an easier time tracking during the chaos. You can do more in the same amount of time...it feels like the game is faster and you have more freedom to play fast (and when switching to 60hz...it feels slow as fuck - for a first person shooter).
With a character like mccree who moves a bit slower and has a slow firing but high damage revolver, you have an easier time seeing enemies clearly as you are jumping and shooting (trying to avoid being an easy target yourself, as you take enemies out). If you are standing still and shooting, there's less of a difference between 240 and 144 - but you're more likely to get taken out.
Unfortunately my 240hz monitor (ASUS rog swift pg258q) has an issue - there are vertical lines all over the screen. They don't always show up, and it's like an interlacing pattern. Often with lighter shades. They appear very frequently in some titles and less in others - possibly depending on the colours the game has. PUBG for example has them a lot. Tekken 7 has them a lot. I haven't noticed them in Cuphead.
At 60Hz and even 144Hz the lines are also much more common, sometimes seeing them when there is nothing moving on the display too. 240hz less so, but they still show up here and there. It can be quite distracting and for an expensive 1080p TN panel, the thing it has going for it is motion clarity, and the lines affect that.
I ordered a replacement from Amazon, same issue. I've seen a few posts about it online, though less than I'd expect. Some are calling it pixel inversion artifacts/dynamic interlacing ... possibly related to the screen trying to display full 8 bit colour range (they tend to be 6bit + FRC) and the FRC might be causing it... I have no idea. If someone has a 240hz monitor without these issues, I'd love to hear about it. Seems very common with Asus, even the 144hz pg278q seems to have the issue. It could be something with all TN panels and I just never noticed before because my last monitor was 4K 27", possibly the vertical lines were there and I just couldn't tell as the pixels were so close to each other.
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