iPhone 12 Pro slow after iOS update

Question

Level 1

4 points

iPhone 12 Pro slow after iOS update

Hello Apple Support,

I am using an iPhone 12 Pro, and since installing the latest iOS update, my device has not been working properly.

I am experiencing performance issues such as slow response, bugs, and system instability. The phone feels laggy and some features do not work as expected anymore.

This update has negatively affected my daily use of the device, and I did not have these problems before the update.

I would appreciate it if you could look into this issue and provide a fix or guidance as soon as possible.

Thank you for your support.

iPhone 12 Pro, iOS 26

Posted on Dec 31, 2025 3:50 PM

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Answer 1

Zachyy

Level 6

15,083 points

Dec 31, 2025 3:59 PM in response to anis147

Try a Forced Restart.

Press and quickly release the Volume Up Button
Press and quickly release the Volume Down Button
Press and hold the Side Button until you see the Apple Logo

Also some settings to check.

Settings > Battery > Battery Health. What percent is displayed?
Settings > General > iPhone Storage. How much storage out of what are you occupying?

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Answer 2

Katana-San

Level 10

84,535 points

Dec 31, 2025 4:03 PM in response to anis147

Hello~ We are your fellow forum members and not Apple Support. Have you tried restarting?

Restart your iPhone - Apple Support

Also what is your battery health??

iPhone battery and performance - Apple Support

If your battery health is 80% or below …get it changed…

Genius Bar Reservation and Apple Support Options - Apple

Find Locations

Post back if needed.

~Katana-San~

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Answer 3

Katana-San

Level 10

84,535 points

Dec 31, 2025 4:05 PM in response to anis147

anis147 wrote:

I tried everything nothing happened

Hello again ~ What about your battery health?

~Katana-San~

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Answer 4

anis147 Author

Level 1

4 points

Dec 31, 2025 4:02 PM in response to Zachyy

I tried everything nothing happened

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Answer 5

Zachyy

Level 6

15,083 points

Dec 31, 2025 4:06 PM in response to anis147

anis147 wrote:

I tried everything nothing happened

Could you please report back on the settings I asked for you to check?

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iPhone 12 Pro slow after iOS update

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