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iOS 15.1 Calendar app is laggy and unreliable

When swiping between days, data often shows up as stale (events on the wrong day, or events at the "right" time but with wrong title).


Keeping the same day view open for up to 10 seconds seems to correct the issue (temporarily). This appears to be some kind of caching bug.


(This was *not* an issue in 15.0, 15.0.1 or 15.0.2. I have one MS Exchange calendar and three Google calendars.)


This has been reported by others as well: https://www.reddit.com/r/iOSBeta/comments/pxyrz2/calendar_is_extremely_laggyunusable_ios_151_beta/

iPhone 11 Pro, iOS 15

Posted on Oct 26, 2021 1:02 AM

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Question marked as Top-ranking reply

Posted on Oct 26, 2021 9:31 AM

Same here with an exchange account. As soon as I remove the company exchange account, it works fine (iCloud only in calendar).


Removing and re-adding exchange account does not help.


ios 15.1

iphone 13 pro

312 replies

Nov 5, 2021 5:37 AM in response to einarmr

Adding my name to the list. I’ve got several Exchange accounts, a couple of Google accounts and an iCloud account all connected, but I only have the issue with one of my Exchange accounts. If that is unselected in the shown calendars list (so I still have the account and it’s still syncing the calendar AND alerting on events), then the calendar is as responsive as normal. Show that calendar though and it all becomes very laggy. This is my main work calendar so there’s probably lots of events with a large numbers of attendees which the other calendar likely don’t have. Not sure if that’s consistent with other’s experience?

Nov 6, 2021 3:28 PM in response to carolramon12

Here's what Apple support just told me:


Hi CUSTOMER,


Thanks for your patience. I received an update about your case. I tried to contact you by phone but was unable to reach you.


Our engineers let us know the issue is currently under investigation, but they do not have a timeline for the resolution so it could be days, weeks, or even months. We recommend keeping your devices up to date in the meantime and please let me know if anything changes. When I hear back with a workaround or resolution I will let you know.


Thanks,


NAME

Apple Support

Nov 7, 2021 6:11 AM in response to einarmr

I gave up after 3 calls with 'senior ' engineers. They asked our exchange team to get in contact with them as the problem (with their failing calendar app) seems to be on our side. what a joke.


they don't care or have the right & competent people. never seen such incompetence in support processes. @apple check bug report which I failed immediate after IOS 15.1 release > FB9724066


I'm really frustrated about apple.

Nov 10, 2021 4:10 AM in response to einarmr

iPhone Xr here, 15.1. Also kicked out Exchange and reconfigured. Nothing changed.


As this is my Company iPhone, I am not able to use the phone right now. It is really important for me, as I can look for changes to meetings and scheduled task in general.


It is a shame, that no one is responding to this. As far as I know, there is no workaround for this.


If I accept a meeting that is a series, the acceptance mail is send out multiple times also. A colleague of mine is having the same issues. I have to now switch of the phone to stop the sending out of the acceptance mails.


Unbelievable...

Nov 10, 2021 4:15 AM in response to einarmr

The latest update from me is that my senior apple support technician rang to update me on what the main tech team say and it was:

Apple cannot fix this, the issue lies with the Exchange server.


I have been told to speak to my company IT dept and ask them to fix it.


That is bizarre and to be honest I don't entirely buy it.

Nov 10, 2021 7:31 AM in response to gstaylor16

That is hilarious. My company IT dept demanded that we all update to 15.1 as the earlier OS "had security risks". And in fact they said anyone checking email from iOS 14 would then be blocked until updating to 15.


Having regretfully done that I am now faced with an unusable calendar! And I cannot even rollback via iTunes as Apple has stopped signing 14!


This is pretty shambolic.

Nov 12, 2021 6:26 AM in response to ECdW023

ECdW023, this is seems like a bullsh*t solution, sorry. The whole point of this thread is that we want Exchange calendars to work alongside all other sources of calendars in the stock, built-in iOS Calendar app. "Select the app that has 'productivity' under the name" – which app is this? The standard iOS one? A 3rd party app?

iOS 15.1 Calendar app is laggy and unreliable

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