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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

Dec 1, 2021 10:14 AM in response to Jrdatrackstar

So, am engaging to add another voice to get Apple’s attention. I called support three times, did the resets on a pad and a phone. Did a movie to upload to show techs then was asked to delete all calendars and start again to give more info to technicians. I stopped there. I had my iPad warranty replaced and the new one acted the same. It’s clearly a programming issue and for the first time I resented the request to kill two more hours to show that I would be at the same place. At least admit it’s a problem and you are working on it!

Dec 1, 2021 12:17 PM in response to einarmr

I tried Apple support--they said the only options as of now are removing the Exchange calendar (might as well not use the calendar at all then) or downgrading to iOS14. And then they disconnected the chat.


Argh, I thought that's what beta testing was for. They did not specify an ETA for a fix.


Just venting, but I thought the benefit of using Apple products is that they control the hardware and software, so it should just work. Is this why we spend $1000 on a phone?

Dec 2, 2021 5:20 AM in response to hockeyrider

I'm with you on that. Apple has always seemed to have good support, and cared about what their customers want. But it’s starting to seem like they truly don’t care. I’ve contacted apple support a couple times, and also left feedback for a couple things throughout the 2 years I’ve had my iPad.


another thing I’ve noticed is:


apple does have people who monitor this, and they see all the complaints. And for the most part, what do they do? Nothing.


I am definitely a Samsung guy, and I urge all of you to try that too. Because Samsung cares!

one of the things they said was that in the newest operating system they released, (One UI 4, based on android 12) they said that most of the changes that were made, were changes that were suggested by the users.

Dec 2, 2021 6:57 AM in response to Yamil

I understand that completely. I don’t expect a response, unless that response is taking action and fixing the problem. Apple has built up a name for themselves in the world of support, and even when you post feedback, or contact support, they really don’t care.


this isn’t the first time a long thread has been made just criticizing apple for HORRID support, and not caring about their customers. That thread was over 200 pages long. Apple supervised it all the way through, and yet never took action to fix it. I will say it again, and again: Samsung makes the best phones and tablets, and they listen to complaints.

Dec 2, 2021 7:52 AM in response to IdrisSeabright

Yes,I understand that…I have tried feedback, I have tried support as well. It’s not like it’s their job to fix it, but I feel like this could be reported to someone higher up, or they could find some way to make it happen. Don’t get me wrong, apple has good products,with (mostly) good support. But I get what you’re saying, and that’s totally true, but they also don’t listen when you place feedback, or have a problem.


Its good that you try to stand up for apple. I just don’t feel like they’re trying I fix the issues here. While, as you mentioned, it isn’t the job of the people who monitor these forums, I feel like they could pass info on, or get just a couple guys who have a dedicated job of passing the complaints on.



Dec 2, 2021 9:17 AM in response to AlexDaMan

AlexDaMan wrote:

Its good that you try to stand up for apple. I just don’t feel like they’re trying I fix the issues here. While, as you mentioned, it isn’t the job of the people who monitor these forums, I feel like they could pass info on, or get just a couple guys who have a dedicated job of passing the complaints on.

They do have people (not all of them male) who are dedicated to the job of passing on complaints and feedback. They are the people who monitor the Feedback page. The people who monitor this form (also not all male) are far, far too busy to do what you want. The team is relatively small and this is one of the largest, busiest forums of its type in the world.


I'm not standing up for Apple. I'm just explaining how things work. You want them to work a different way and it's fine to want that. However, in the world as it actually is right now, complaining here will accomplish nothing other than perhaps some catharsis.

Dec 2, 2021 11:04 AM in response to wouter-58

I just had a long chat with Apple Support and, after about 45 minutes, I was able to fix the calendar app problem on my iPad. In summary, I had to restore my iPad to its original factory configuration, which I did by connecting to a separate MAC (although it can also be done through a PC) and then I restored my iPad with previously made backup . Just tried the calendar app and it is working...

Dec 2, 2021 12:33 PM in response to wouter-58

wouter-58 wrote:

I am quite convinced Apple is aware of the issue and for quite sure they work on a fix, like they have to fix many other issues.
I can also imagine this Calendar issue is not considered a critical bug, hence the release of a fix will take some time, lets trust that they thoroughly test the fix, which takes time.

I suspect you're correct in that this is not considered a critical bug, especially as it doesn't seem especially widespread. For the end-user, those are some of the most frustrating. I don't have this issue but I sympathize with those who do.



Dec 2, 2021 1:53 PM in response to Appnul

Appnul wrote:

Based on the number of emails I’m getting I think it is very widespread indeed

If you mean emails from this thread, no, that wouldn't indicate it was widespread. You've probably gotten four of five notifications that I've posted in this thread, for example, and I don't have this problem. Other people have also posted multiple times. When an iOS problem is widespread, there are scores of very long threads.


It's actually kind of a disadvantage that it's not widespread. If it were, it would get Apple's full attention that much sooner. But, since it's not, you should keep submitting feedback.

iOS 15.1 Calendar app is laggy and unreliable

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