New iPhone is really slow after iOS update

(1) Try and Force Restart your iPhone EXACTLY as shown below and see whether that resolves the issue:

• Press and quickly release Volume UP button
• Press and quickly release Volume DOWN button
• Press and Hold the SIDE button until an Apple logo appears and then release the Side button (Can take up to 20 seconds. (DO NOT release Side Button when invited to Slide Power OFF). 

(2)  If that does not help, then take advantage of the 1YR Limited Apple Warranty on your iPhone 14 Pro and contact 👉 Official Apple Support OR you can always get your iPhone examined at the Apple Store 👉 Genius Bar Reservation and Apple Support Options or at an Authorized Service Center for further diagnosis and a resolution.

Axel F.

gianni333 Said:

"New iPhone is really slow after iOS update"

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Report this as a Bug to Apple:

Do your Part: Provide Apple with feedback on this, letting them know about this issue.  Apple may not get back to you directly, but the more feedback they receive on this, the more they will know what is occurring, and what bug fixes to include in updates to come.

1. Go Here: Feedback - iPhone - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Comment: that this all began after installing an update. Include the URL of this post
4. Proceed from there as necessary

i dont guarantee it to work but i found this on reddit and it worked for me. Basically you can try turning off automatic updates because since i upgraded from my iphone xs to 13 i had them on and ios 17 started getting laggy and problematic. I searched for iphone 13 specific reason but give it a try and after turning it off reatart your phone. Still have had the same once a day random stutter i had with every iphone i had but its nowhere as bad as ios 17 started lagging 2 minutes after restarting and didnt stop until restarting again.

Option (1) from Axel Foley helped, iPhone XS 256Gb, happened first time after apdate to IOS 17.X, browsing speed was very slow or non-working at all, after fix returned to normal.

Glad that helped improve the performance of your iPhone XS.

Axel F.