iOS 15.1 Calendar app is laggy and unreliable

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?

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

Experimenting with my own setup (Gmail+Exchange+iCloud) it seems like it's definitely a problem with Exchange. If I deselect my Exchange calendar from being show, the problem goes away altogether. Which is a bummer because my Exchange calendar is the main one I use.

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.

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...

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.

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.

Thanks this is so helpful. I feel like telling my apple tech in triumph.

there’s obviously still something not quite 100% about it as the calendar still has a barely perceptible visual glitch on some of the entries if you stare at it.

This fix of deleting the app and reinstalling did not work for me. I went through this with Apple Support and still still the same issue post reinstall. Lots of lagging, crashing, appointments all off, etc.

Apple Calendar is also broken on my new M1 Max 14 MBP with Monterey 12.0.1. So maybe there's something in the shared code that's crippling every platform.

It's essentially unusable. I'm trying the Luni Calendar for a while and may never go back.

Grrr....

The single day view in Portrait mode seems to work on my iPhone 6s.

You can swipe through the days of the week and move to an adjacent week by swiping the top row (showing the week dates).

But that single day view lacks the flexibility and overview of the regular Portrait week overview.

This problem is really annoying as everyone else is saying. Thanks for the solution to toggle to dark mode and back. That works in the short term for me too. Hopefully apple can get this bug fixed ASAP.

I've tried out. Indeed the cal app does not hang. BUT as I edit any arbitrarily chosen calender entry, it shows up with a different entry's headline, i.e. the app mixes data. And as soon as I select Day View, the app freezes.

Workaround does not work for me.

That "fix" is in the MacOS "you know what" as well as the iOS "you know what."

Again, my suggestion at the beginning of this thread (shut off Exchange sync/view) will also exhibit a workaround. So, if you are needing to view or make changes to the non-Exchange calendars, you can do that until something happens from Apple.

aps