iPhone so slow and laggy after the update of IOS 14.5.1

To any ll who have posted recently - how much time has passed since you updated to 14.5.1 ??  As Dogcow-Moof posted - most problems resolved themselves after 24 hours +.  I initially had really slow (slaggy) system when I updated to ios 14.5.1 but after 24 hours it improved and now it works fine (iphone (7) and ipad (2020). 

Hi Guys,

here’s a small fix i found to work well on my Iphone:

1. Go to settings -> Your Apple ID -> Icloud -> Back up your settings on Icloud

2. Go to settings -> General -> Reset

3. Click on ‘Reset All Settings’

Let your iphone reset itself settings and reboot.

NOTE: This will not delete any of your content or media only your phone’s settings and will recalibrate your phone’s performance.

IMPORTANT: Check that your storage space isn’t full or significantly exhausted. If it is the you’ll have to free up a significant amount of space otherwise this won’t work 100%

please let me know if this helps!

Click on ‘Reset All Settings’

Finally. I called Apple support. The walked me through a reinstall of the 14.5.1 complete iOS operating system --essentially returning my iPhone to "factory" new with a new install of 14..5.1 --not an update to 14.5.1, but install of the iOS. It did not help. Still could not use Apple News, Ring, Smart News, scroll various web sites, etc. --a real mess. Then --I thought to try something. I charged my WiFi setting to an exclusive 5G setting instead of the previous old setting. Everything now works perfectly. Research leads me to believe that there is something in the update to 14.5.1 that optimizes on 5G. Give it a try. Let me know if it works for you.

Newest report. iPhone lost its Cellular account connection to ATT. Tried to fix that via my ATT online account, but was locked out. Called ATT. They said that they had noticed "suspicious" activity related to my iPhone account (not my wife's phone on the same account). That activity related to "difficult/slow" downloads, "etc.". So with that in mind, the agent walked me through a complete reset of my phone including erasure of ALL data. My iPhone was then restored using a March 4 iCloud backup --when the phone was working perfectly. Part of that restore involved downloading ALL Apps from iCloud and/or Apple App Store --I am unclear from which. At any rate, this morning, about 18 hours after that App download began, it continues --surly not a normal amount of time for that download to last? At this point there are nine "waiting" and two "in progress". Given the amount of download traffic still in progress, I was not surprised that Ring still will not display video of any recent stored triggered events on either of our cameras. When App downloads finish (if?) and the Lightning/USB-C cable arrives I will try the the sync of my iPhone to my MacBook Pro as someone suggested and then report.

Do remember that all phone performance will be a little slow (and battery consumption higher) for up to 24 hours after installing a new software update as various internal phone databases will need to be rebuilt.

How full is your iPhone storage? If your iPhone is at ~capacity, try freeing some storage, and see if the performance issues then resolve.

Try iOS 14.6, released today.

Update iOS on iPhone - Apple Support

I can confirm that iOS update 14.6 solved the problem for me.

Hi ruffyoung,

One more thing to check is the battery condition. If the battery has degraded the CPU and GPU performance could be managed.

"This performance management works by looking at a combination of the device temperature, battery state of charge, and battery impedance. Only if these variables require it, iOS will dynamically manage the maximum performance of some system components, such as the CPU and GPU, in order to prevent unexpected shutdowns."

iPhone Battery and Performance

Cheers.

Yes, there's an issue that messes up the low energy mode. I didn't have to restart mine at all: I just started a sync on the Mac and it started to behave normally right away.

No problem ever since (iPhone 7 +).

My phone worked fine for couple of days after 14.5.1 but one day every app seemed lagging. Unable to redial on whatsapp, even settings lagged.

then i read one of the suggestions in this very thread/topic. Now its working fine.

Heres what i did:

-Turn off iphone and let it rest for a minute

-plug in the lightening cable and let it turn On itself.

…solved since!

I think I discovered the solution to my problem, though I'm not sure if this will help anyone else out. In the off chance it might, here goes.

Wiped my phone, restored via iTunes. Didn't solve the issue.

My battery was at 83% so I had apple replace it. Didn't solve the issue.

"Set up as new phone" then restored from icloud. Didn't solve the issue.

Mortal Kombat Mobile - I deleted the App, deleted the data (automatically asked when I deleted the app). Tried a few hours without it. Re-downloaded the app, after going through the tutorial it requires re-linked my account and so far I haven't experienced any 10 second "freezes." (inside or outside of the game).

It has almost been a day, but so far I have not experienced ANY freezes lasting longer than 1-2 seconds (which could be chocked up to background processing).

I think it was just a corrupted file or something having to do with MK Mobile. Additionally, since doing the above, the game doesn't appear to be crashing as frequently as before (which was a lot).

Good luck!

Yep, the 14.6 update resolved the issue for me as well. Faith in Apple restored.

Often, it takes a lot of power and battery to get an update started. If you just updated, I’ve it another day or so. That fixed my issue with 14.5.1.