iPhone lagging after iOS 18 Update

Adjusting Siri and search settings and following other suggestions from this article: 9 Steps to Fix an iPhone That's Lagging and Slow After the iOS 18 Update fixed my lagging issue. I hope this helps. 

THE 18 UDATE LITERALLY RUINED MY PHONE.. NOTHING LOADS.. Safari, Apps, Games, Text Messaging-Everything is literally screwed up. I can’t find pictures AT ALL!!! I type in the search for words and NOTHING shows up.. I want to uninstall this BS, how can I?????

after ios 18 installing in my iphone 11 my iphone was very laggy and chopy all apps are very laggy please solve my problem Thanks!

I have the iphone 15 pro Max not even 1 year i updaten my phone to the iOS 18 everything is slower like typing, opening and locking, swiping my phone is literally glitching after this phone i swear i wil not buy an iPhone again After 9 years of being an iPhone user, I don't like the iPhone anymore

Im finding multiple apps pausing for 30 seconds either on start or later. You tube, Safari, email, discovery+ and probably many others. Its infuriating snd that's with s brand new phone with ios18 pre installed

i updated yesterday to 18

im on 14 pro

i have the exact same issue. constant frame drops, even on youtube..

restart didnt work, storage is ok

game setting equal to ios 17

the ios 18 update has performance issues and you cant blame the iphone.. im assuming they dont dont do it on purpose since 14 pro should still be a valid phone, right?

anyways next week in getting the 16 pro, ill check the performance there on ios 18

for now no more gaming, maybe ill read a book.

Yup same happened to me too. I have iphone se 2022 bought it fall 2023 and ever since I updated from 17.6.1 to 18 its been laggy and slow. Sometimes I have to touch things a few times for it to recognize that Im opening an app or something. Just fyi apple wont fix any of these bugs for another year. This always happens. It takes them forever to fix an issue thats a year old.

Same problems here iPhone 15 plus

Wow, is this really the best an American company can do these days? How did this update get out the door?

soo… heres my update

i got the iphone 16 pro (on ios 18)

and all my lagg issues are gone..

gaming goed smoothly even on higher settings than on 14 pro (genshin impact, mobile legends).. even youtube is working without frame drops

i guess its true, they force you to buy a new phone every 2 year..

oh well.. guess i dont have have to read a book anymore.. did only finish 1 page tho in 3 days

I’m experiencing this too, and I found this article with a suggestion that worked: https://www.idownloadblog.com/2023/04/07/how-to-fix-slow-search-on-iphone/

Toggle Search off and on

1. Go to iPhone Settings and tap Siri & Search.
2. Scroll down and turn off all the switches you see in the screenshot below.
3. Restart your iPhone.
4. Go back to Siri & Search settingsand turn on the switches. After this, Spotlight Search should work as intended.

This makes sense that it works because after an OS update, Siri updates its search index for your phone messages, mail, and apps. It can take a long time and while it’s working in the background, apps slow down and searching can take longer than usual, and you might notice Photos.app says that it’s not syncing to iCloud because it is “optimizing system performance.” To help it along, I also made sure to turn off low power mode and plug in my phone so that the phone can run these long tasks as quickly as possible. 

I have an iPhone 14pro 256 (50 gb free), after the iOS 18 update, it got very laggy:

1. The keyboard already faced some issues, i don't know why, as i think that this is a very basic app which should not face any issues no matter how slow the phone is. And after this update, this issue has reached a next level where sometimes i just have to type in thin air (swipe gestures), because the keyboard didn't show up.
2. Scrolling especially in WhatsApp has become very laggy where for the first 10-12 seconds after i open the app, i physically can't scroll.

This is not correct I have a 16 pro and 17.7 and then 18 both screwed up my phone

this is really a terrible update from Apple and it has been many days without it being resolved

iPhone 12 Pro has 214GB of available space. It is only for business use. It was updated from iOS 17 to 18.1, and the UI interface is lagging and freezing at times.

Apple needs to go back and fix it.