You have problems with iOS 11?

Anyways, it's definitely stable, honestly I feel like it's the most stable .0 release I've been on (have been going beta -> GM on almost all releases).

I do experience lagging even on basic stuff like writing SMS or other-text inputs... (waiting 2-3 seconds for the soft keyboard to response). I'l have to do some Option->Reset when I find time... [iPhone 6+] Not good when you can't trust the device... once my iphone freezed for X seconds, then I realized that random social post were posted to FB, while I tried to touch the display... :) And that scares me :) I have to give a try to the "Reset" options :)

I own an iphone 6+ too, this could also be a hardware issue. It started for me with the touchscreen going unresponsive for a few seconds and then suddenly 'catching up', it got progressively worse so I got it repaired. Hopefully it's purely a software issue in your case but just in case : https://www.apple.com/support/iphone6plus-multitouch/

Experienced the same issue, please have a look at Privacy->Analytics. If you (like me) find a lot of errors related to mediaserverd, then 'reset network settings' will likely fix it (like it fixed the lag on my 6S after upgrading to iOS 11).

I don't experience input lag, but I definitely experience general UI lag. Everything is so jittery compared to iOS 10. Swipes, transitions, everything lags.

I experience lagging on iOS 11 on both iPhone 7 and the 10.5 inch iPad Pro.

There was no lagging on iOS 10.

Basic things like swiping across home screens lags and feel jittery. Also when you unlock and the apps come into view it's annoying laggy.

I had similar problems on my iPhone 7 when I upgraded to iOS 11. This included apps totally freezing, sometimes for what felt like a minute, with very laggy input, as well as other issues, like not displaying the playing podcast controls for Overcast on the lock screen or in control center. Yesterday I did a fresh install of iOS 11 and then restored from a backup and my problems seem to have gone away. At least for me, it seems like there may have been something wrong with the over-the-air upgrade process. Perhaps this will help you.

Hmm, that means redownloading 50 GB of photos, but I guess I could try it. Do you know if you could force download all the iCloud Photos library instead of having it load on demand? Even with Settings -> Photos -> Download and Keep Originals it seems old photos (from before the device was installed) are only downloaded on-demand. I want them all offline.

I'm having this problem on both my iPad (which is newer than my phone) and with my laptops. Old pictures are not there unless I view then, although new pictures seem to be pushed to all my devices. And even if I view then, they are downloaded only at medium quality, unless I view them for more than 1.5 seconds or I zoom into them. This means I can't even scroll quickly through them, as this won't get me the original quality I want.

I don't take a ton of photos, so I don't know the answer to your question. Sorry :(

Don't choose "optimise storage" and it will try to keep all photos locally.

It will try to keep new photos photos locally, but it doesn't seem to be downloading old pictures unless I zoom into them.

Same here. On 6S animations lags very often, on iPad Pro 10.5 swiping window to multitasking causes dropping frames.

Try 'reset networking settings', this fixed it for me. Appears to be related to mediaserverd crashes (check Privacy->Analytics if that is the case on your 6S as well).

Similar experiences with tvOS 11 on the non-4k model.

Have had no lag-g-g-g-g problems with iOS11. Maybe it's the device?

iOS 11 on my iPad Air 1 is laggier than iOS 10, but on my 6S is faster than iOS 10. Not sure why..

iPhone 6S has a way superior CPU, and storage speed to the iPad Air 1.

The iPad Air only has 1GB of RAM. I've always suspected it would age badly because of that.