Do apps have to be optimized to see any difference with ProMotion 120Hz ?
I use GoodReader for PDFs and Dolphin as browser.
Will I notice any difference in these ?
The way I see (and I hope someone corrects me if I’m wrong about this) - every app that uses standard OS animations is 120Hz. Most apps lean heavily on Core Animation to move things on the screen and these will work in 120Hz. I’m pretty sure both GoodReader and Dolphin fall into that category and, yes, they will use ProMotion. Some apps, on the other hand, use custom animations - for example, when you draw in Procreate, games, etc - so those have to be updated to take advantage of ProMotion (assuming they are able, an intensive 3D game can’t render in 120Hz because it’s too demanding on the hardware).
Whether you’ll notice it is another matter. I can say this - for me, there certainly is a difference, but sight is a very psychological thing and depending on the person, you’ll see anything from a huge difference to none at all. Personally, I didn’t see much difference when I started using my new iPad Pro, however when I tried a last gen one - I was surprised how choppy all the animations felt. Funny thing is, when I look at an iPhone screen, it doesn’t seem as choppy even now, I guess due to the fact that the screen is smaller. Weird.
Short answer: yeah, most people will see the difference, some will care more, some less. It’s a cool feature and not a gimmick, for sure.
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Some people's ears can't even discern the difference between the Apple EarPods and a good pair of earphones, it doesn't mean that those earphones are not better than EarPods. Some people has difficulty discerning between certain colours, it doesn't mean that Apple is not using wide colour gamut. Some people cannot see higher refresh rates, and it doesn't mean that Promotion isn't there.
Very true - a good analogy. Most earphones of the same size sound the same to me (I can discern only a difference between really bad ones and really good ones, but nothing in between) but I don’t claim the difference isn’t there. ProMotion is definitely something that’s real - but not everyone can enjoy it as much.