iPhone 8 slow performance.

What have you done to solve your iPhone 8S issues?

What 8S storage size model do you own and how much free data storage space is left on this iPhone?

Have any of you tried a hard reset of your iPhone 6/6S by holding down both the Home and sleep/wake buttons until your iPhone goes to black and restarts with Apple logo, then release the buttons?

iDevices need to maintain, at least, 2-3 GBs, OR GREATER, of free data storage space.

In Settings App, Battery, check to see if any apps/processes are eating up your battery.

In Settings app, General settings panel, turn OFF Background App Refresh for any apps you feel do not need constant data updating/Internet updating in the background when not using the an app OR turn OFF Background App Refresh entirely/globally for the entire device.

Do the same in the Settings app under Notifications.Turn off notifications for apps you do not think you need notifications for and/or edit the different ways you receive notifications to help with performance by not always using all the notification methods together.

In Settings app under Mail, you may want to set a longer fetch time or set your iOS Mail app to only manually fetch your mail ONLY when you launch the iOS Mail app.

In Settings app, under General settings, Reset panel, at the right bottom of the list, Reset All Settings.

In Settings app (NOT from the iOS Control Panel) turn OFF Bluetooth when not using any Bluetooth devices.

Also, in general, if you want a faster IDevice, on all of my iDevices, I turn off most of the iOS motion graphics eye candy, by simply turning ON Reduce Motion in Settings app, General, Accessibilty settings.

Make sure you aren't running scads and scads ( 20 to 50 OR MORE ) of background apps in the iOS 11 Control Panel/App Switcher.

If you are, you need to quit the bulk of these background running apps by tap and hold a finger on an app window in the switcher and slide your finger upwards to quit an app. You should be able to use more than one finger to quit more than one app window simultaneously.

Also, make sure you don’t have scads and scads ( 20 OR MORE ) of active website tabs running in the web browser.

If you do, greatly reduce the amount of active website tabs your web browser.

Some minority of user have been turning ON and leaving ON iCloud backups continuously backing up on a constant and daily basis.

If you are one of these users, in Settings App, tap your Apple ID, then tap iCloud, then find iCloud backup and turn off iCloud backup and only turn this on to do daily backups either when you are not using your iPhone for a prolonged period of time (like when you are sleeping), then turn iCloud backups OFF when actually using your iPhone.

OR

Only perform your backups on a lesser time schedule.( like twice a week, once a week, once every two weeks, once a month, etc.).

Any large amount of background running apps or active processes that have to constantly go out to the Web to fetch data ALL THE TIME is going to slow down ANY iDevice.

What other things have you tried other than multiple hard resets to solve your iPhone 8 issues?

I certainly realise that you own a pretty new iPhone, but I suggest you try things in this list to regardless.

How much free data storage space is left on your iPhone?

iDevices need to always maintain, at the very least, between 2-3 GBs, OR GREATER, of free data storage space.

In Settings app, under General settings, Reset panel, at the right bottom of the list, Reset All Settings.

In Settings App, Battery, check to see if any apps/processes are eating up your battery.

In Settings App, General,Reset, Reset Network Settings, try resetting your network settings.

In Settings app, General settings panel, turn OFF Background App Refresh for any apps you feel do not need constant data updating/Internet updating in the background when not using the an app OR turn OFF Background App Refresh entirely/globally for the entire device.

Do the same in the Settings app under Notifications.Turn off notifications for apps you do not think you need notifications for and/or edit the different ways you receive notifications to help with performance by not always using all the notification methods together.

In Settings app under Mail, you may want to set a longer fetch time or set your iOS Mail app to only manually fetch your mail ONLY when you launch the iOS Mail app.

In Settings app (NOT from the iOS Control Panel) turn OFF Bluetooth when not using any Bluetooth devices.

Also, in general, if you want a faster IDevice, on all of my iDevices, I turn off most of the iOS motion graphics eye candy, by simply turning ON Reduce Motion in Settings app, General, Accessibilty settings.

Make sure you aren't running 50 OR EVEN MORE background apps in the iOS 11/12 App Switcher.

If you are, you need to quit the bulk of these background running apps by tap and hold a finger on an app window in the switcher and slide your finger upwards to quit an app. You should be able to use more than one finger to quit more than one app window simultaneously.

Also, make sure you don’t have 20-50 OR A WHOLE LOT MORE of active website tabs running in the web browser.

If you do, greatly reduce the amount of active website tabs your web browser.

Some minority of user have been turning ON and leaving ON iCloud backups to continuously backing up on a constant and daily, 24/7 time basis.

If you are one of these users, in Settings App, tap your Apple ID, then tap iCloud, then find iCloud backup and turn off iCloud backup and only turn this on to do daily backups either when you are not using your iPhone for a prolonged period of time (like when you are sleeping), then turn iCloud backups OFF when actually using your iPhone.

OR

Only perform your backups on a lesser time schedule.( like twice a week, once a week, once every two weeks, once a month, etc.).

Any large amount of background running apps or active processes that have to constantly go out to the Web to fetch data ALL THE TIME is going to slow down ANY iDevice and can, also, negatively impact battery life.

In addition to all of the possible fixes and solutions presented, other iPhone users, in other postings, in the iPhone support communities, suggested to go into Settings, General, Accessibility, Increase Contrast and turn ON Reduce Transparency.

Your iPhone 8 won’t look as pretty, but users reported that their iPhone speed improved considerably.

Good Luck to You!

Check all of this.

How much free data storage space is left on your iPhone 8.

It has to have and maintain, at least 3GBs or greater free data storage space.

In Settings app, General settings panel, turn OFF Background App Refresh.

In Settings app, under General settings, Reset panel, at the right bottom of the list, Reset All Settings.

In Settings app (NOT from the iOS Control Panel) turn OFF Bluetooth when not using any Bluetooth devices.

Also, in general, if you want a faster IDevice, on all of my iDevices, I turn off most of the iOS motion graphics eye candy, by simply turning ON Reduce Motion in Settings app, General, Accessibilty settings.

Make sure you aren't running scads and scads of background apps in the iOS 11 Control Panel/App Switcher.

If you are, you need to quit the bulk of these background running apps by tap and hold a finger on an app window in the switcher and slide your finger upwards to quit an app. You should be able to use more than one finger to quit more than one app window simultaneously.

Also, make sure you don’t have scads and scads of active website tabs running in the web browser.

If you do, greatly reduce the amount of active website tabs in your web browser.

Any iDevice CAN get taxed if too many “things“ are hapenning at once.

Yes, even an iPhone 8.

Maybe to a lesser extent on a iPhone 8S and X because those phones have 3 GBs of RAM.

All 3 phones have incredible CPUs and internal graphics, but an iPhone 8 (not the 8S or X ), STILL only has 2 GBs of RAM!

If you have, for example Background App Refresh ON, if you have scads of apps that constantly need to go out to the Internet for data, if you have, say 30-50 apps open that need to constantly go out to the Internet for data, this is going to use a LOT of both CPU and RAM cycles/resources, CONSTANTLY!!!

The same if you have a web browser in the background with scads of active web tabs active, IN ADDITION, to all of the apps pulling data from the Internet in tge background, this is going to use EVEN MORE CPU and RAM cycles/resources.

The net effect of all of this is that it is going to slow down a mobile device with all of the background Internet activity happening.

I own a iPhone SE, iPod Touch 6th gen, iPads 2 and 3 and a large screen iPad Pro (with a very powerful CPU/GPU and 4 GBs of RAM)

On all my iDevices to eek out even faster performance/response, in the Settings app, General, I turn ON Reduced Motion to reduce all of the iOS motion eye candy (none of these motion graphics does nothing important benefit to iOS and actually robs the CPU, GPU and RAM of even more processing cycles.

You are confusing data storage space with RAM ( Random Access Memory).

You have an iPhone 8 Plus with 256 GBs of flash memory data storage for apps and data.

iDevices and iOS use a CPU ( Central Processing Unit ), GPU ( Graphics Processing Unit ) and RAM.

Your iPhone 8S ONLY has 3 GBs of RAM (memory), NOT 256 GBs. 256 GBs is your free data storage amount.

You CAN tax that 3 GBs of RAM IF you have too much happening on your iPhone running in the background AND if all of these background processes AND background apps are having to constantly go out to web to update data on your iPhone.

I just tried this minus the “reset all settings” issue.

Once I did this, i was able to update my iOS, where before it showed there was an update, but it simply said “checking availability” when I clicked on it (it wouldn’t even show the update information). now it popped up quickly and correctly.

I am updating my iOS now on my iPhone 8S Plus to 12.1.2.

I was having a lot of issues with Rise of Civilizations game (by Lilith Games) which seemed to be the main cause of my memory drains (the keyboard would lag horribly, the wi-fi would get sketchy, and opening other apps with heavy keyboard use like Messages would lag terribly or just not update).

— update:

I finished the update and checked my settings. I got back into the Lilith Games “Rise of Civilizations” and found the keyboard to cause crashes when I moved to my Japanese Kana (flick only) keyboard. I uninstalled all my keyboards, and found that my keyboards just caused crashes in general (no extras, just crashes).

I believe for me my problem is this one game. You probably don’t have this game installed, but try checking for a particular app that seems to be the source, then uninstall it and see what happens.

Have you tried a hard reset of your iPhone by holding down both the Home and sleep/wake buttons simultaneously until your iPhone goes to black and restarts with Apple logo, then release the buttons?

Your new iPhone 8 has a different issue/s than the Original Poster, obviously.

If YOUR iPhone 8 is fairly new, then yes, your iPhone 8 has some issue.

Bring it into your “local” Apple Store and, if within 14 days of purchase, ask for a refund or another replacement iPhone 8 and set it up in the store and make sure it is working as it should before you leave the store.

Good Luck to You!

Low battery mode(yellow battery) throttles the CPU and GPU.

It is still under warranty. Bring it into your “local” Apple Store and have the store employees diagnose your iPhone 8 issues.

While you are there, if you haven’t done so yet, you still have about two more weeks to purchase extended, two year AppleCare+ for that iPhone.

Good Luck to You!

did you tried a speed test ?

iOS 12 definitely speeds up your iPhone

https://www.cultofmac.com/553599/ios-12-performance-improvements/

https://support.apple.com/ios/update

in the iPhone 8/X.. the power and home do not initiate a hard reset.

its volume up, volume down, then power