undefined | Better HN

0 pointsmegous2y ago0 comments

Yeah, no. Just tried on rando iPhone SE 1st gen I have here for some tests, and it lags on scrolling just like any other phone from similar era. You just slide back and forth slowly and observe the content of the screen pretty clearly not following the changes in direction immediately, and you can observe about 1-2cm distance between your finger and text.

It's impossible to be in sync anyway, unless you avoid VSYNC, and then you'll have tearing ans at best halve the delay. There are limits to these things that not even "Apple" can violate.

And first iPhone sure was not faster than SE.

Maybe with some 120+Hz refresh rate, and some SW tricks, you can get close to what you're talking about. First iPhone did not have that.

0 comments

vladvasiliu2y ago

Sample size of 1 and whatnot, but this has absolutely never been my experience on my iphone 7, which I've kept up to date and stopped using less than a year ago. Scrolling in Mail, for example, was the contents following my finger. Hell, I complain about Android phones, even newer ones, which lag while scrolling the settings app, but even there I've never noticed that big of a distance between the finger and the text.

Never handled an SE, though, but I doubt it's worse.

megousOP2y ago

https://nanoreview.net/en/phone/apple-iphone-7

> Response time 35.5 ms

So at 60 fps, that's 2 frames delay + some. (and this is just display response time and doesn't include the content rendering, double buffering, and the input lag)

Here's the input lag for phones from similar era as the SE 1st gen: https://blog.gamebench.net/touch-latency-benchmarks-iphone-x... (88ms)

Another set of numbers: https://danluu.com/input-lag/

You can move your finger quite far in 80ms.

j / k navigate · click thread line to collapse