I have been using iOS 11 for a few days now and have found that my iPhones battery donest last as long I have a iPhone 7 Plus the camera app sticks when opening apps it is very slow the mail app seems to not want to update and retrieve my mail a lot of pre installed apps on the iPhone crash or become non responsive, lock screen seems to have part of the music player of and sticks there I hope Apple can review these for next beta and patch as the feedback app does not have the option to feedback for iOS 11
Hey, sorry to hear you’'re experiencing some battery issue with your iPhone. You may want to head to the Apple store so they can have a look at your device.
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At least the battery usage for Memrise is down to 36% on my system compared with over 50% two months’s ago. Still high but at least some of the performance issues seems to have been fixed.