iOS 15.1 Calendar app is laggy and unreliable

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

I also am seeing this bug. Did not see this issue at all before 15.1. I am using Exchange, Outlook.com, and iCloud calendars. I also have a number of Subscribed calendars. I see the calendar load, but it takes a long time to refresh as I swipe through days on the calendar and/or it will show the time blocks on the calendars for meetings, but the wrong information will appear in the meeting time blocks. I also see this issue on my iPad which I also updated to 15.1 at the same time. If I display the Calendar on the iPad in Day view, I don't really see the issue, but if I switch to Week view and swipe left and right things get all messed up. If I tap a meeting in the iPad to view the contents, it will actually show the proper details and then when I tap off the time block on the calendar will refresh and then it is correct. I took a screen recording and send it to Apple under the case I opened.

Thanks for sharing. Clearly there are many people experiencing this. I’m surprised Apple is having people reset all settings. I have no plans to try that. The issue is clearly a problem with the Calendar apps internal code (i.e. a bug). hopefully we see it fixed rapidly in a 15.1.1 release.

I don’t think anyone should be resetting anything, let alone doing a complete factory reset of their phone. This is clearly a bug in the iOS Calendar app and a bad one at that. I can’t believe it got through testing and I hope Apple expedites the fix. I live by the Calendar app as an employee, parent, and volunteer. To not have the Calendar app working is a huge pain and disruption.

I had the same issue. This seems to have worked for me:

(I found this on https://piunikaweb.com/2021/11/12/apple-calendar-app-on-ios-15-1-unresponsive-lagging-or-not-syncing/)

Update 1 (November 12)

06:15 pm (IST): An individual claims to have a workaround that helped them fix the issue. Check it out below:

FIXED! I contacted support after trying the fixes here. This is what worked

go to your calendar

delete (yep scary)

go to app store

search “calendars”

select the App that has “productivity” under the name.

download/install

all appointments came immediately back on (Source)

I’ve been having the same issues and still am having freezing with ios 15.1.1

I installed another calendar to use in the interim

https://apps.apple.com/us/app/calendar/id1113106806

working much better and no issues at all. Synced to my exchange and gmail accounts

AlexDaMan wrote:

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

This is a user-to-user forum. The Apple employees who do monitor this do so only to make sure that people adhere to the terms of use. It is not part of their job to look for and process feedback. Apple has a separate place for that:

Product Feedback - Apple

The fact that Apple doesn't listen to complaints made here doesn't mean they don't listen.

johnogrady wrote:

Of this is apple rubbish response you need to take note. You have caused huge issues with peoples calendars due to poor testing and release mgmt.

the arrogance of apple is disgusting. Get this fixed before you loose many users.

How many times do I need to explain that Apple doesn't read here for suggestions or feedback? If you want Apple to know of your "disgust", use the appropriate mechanism:

Product Feedback - Apple

Richie-red wrote:

Any ideas on when this will be resolved?

No one here in this user-to-user forum would know. Anyone who says they know is speculating, something that isn't permitted here.

I suggest you give your feedback to Apple. The more people who do, the more attention the issue is likely to get from them.

Product Feedback - Apple

Roberto2021 wrote:

It’s a good workaround.

I’ve waited too long for upgrading to latest release and now I regret of doing it.

I will try the Outlook App instead …

Apple: please fix this 😓

Apple doesn't read here for suggestions or feedback. If you want them to know your thoughts, use the appropriate link:

Product Feedback - Apple

Meanwhile, using a different calendar app sounds like a great idea. I've found Outlook to be quite nice to use.

Deleting the calendar app and reinstalling it worked for me, for at least one full day. Just had to change the default calendar colors to what I used before with three different calendar accounts.

More details at where I first posted on this other thread:

https://discussions.apple.com/thread/253296151?answerId=256464064022#256464064022

MUFC81 wrote:

This is a total disaster. When will we get a fix.

The issue that this thread is about, the calendar lagging in iOs 15.1 has been fixed by the subsequent releases.

If you are running a later version of iOS than 15.1 and having a problem, you should start your own thread. You're more likely to get help that way than you are just pending a response on to this rather long and old thread.

You should also let Apple know you have this different problem either by leaving feedback:

Product Feedback - Apple

Or contact them directly using the "Get Support" link at the top right of every page of these forums.

Same here.

And I am completely baffled by the quality of iOS 15.1 it’s barely usable in an business critical environment.

• so calendar is completely broken (lagging, ghosting, full day events disappearing etc, )
• but I also found that the calendar widgets are effected as well (not loading only showing place holder things).

worst part is got a call from apple care support that was zero use to me and instead of pulling a log file / report they told me I have to “factory reset completely restore the device, that’ll fix it”.

i did it (stupid enough) and nothing changed!

I'm trying to figure out what I can learn from this. This is what I've come up with:

1. Never install a major or minor release until a few weeks afterwards, and/or a few patch releases. Once this is patched, that'll be the version of iOS that I'm locked on for a long while.
2. Never, ever, ever allow auto-updates. Never. Not if you value ever getting any work done.
3. Apple has lousy regression tests for anything that's not Apple. They're seemingly completely out of touch with the reality of people who have Office365 at work. A lesson in how hard it is to do real regression testing, perhaps.
4. Apple doesn't care about fixing an issue like this (or even communicating) in a reasonable time frame. The app is UNUSABLE for Exchange users. It's UNUSABLE. There's no other way of describing it.
5. To preserve your own mental health, you have to expect this kind of stuff, pay attention to the top few points, and always have a backup.

So I started out being infuriated, now I'm just convinced they simply don't care, have broken QA when it comes to non-Apple everything, and to lower my expectations accordingly. Their hardware is fine; but I'll look to other software / cloud ecosystems.

I had this problem on my iPhone (Exchange extremely slow, dates showing wrong events, etc.). So far it looks like I have mostly fixed it by disabling the "iCloud Private Relay" on my Wi-Fi connection. It loads and updates faster.

Here are the steps.

• Open Settings
• Select "Wi-Fi"
• Click on the ( i ) info circle for the wi-fi network to which you are connected
• Scroll down and UNSELECT the "iCloud Private Relay."

This lessens the problem, but it means disabling the new security enhancement.

This helped a lot for me. I suspect there is still something going on with the App itself.