calendar is slow to respond after update to ios 15.1 on iphone XSmax

I was almost happy: the Calendar in landscape is very responsive to touch, as it shall be.

But the contents is often rubbish with appointment coloring spanning more time or more days that what they are set for.

The appointment coloring changes when you slide the Calandar left and right. In one word: useless.

So Calendar in portrait responds terrible to touch, Calendar in landscape shows random coloring.

Same here, on my iPhone 11 Pro, Calendar super slow, takes minutes until scrollable, but still sluggish then. That app is not usable anymore actually and that's really nasty, actually working in an important long term project where have to deal a lot with invitations.

Everything was fine with Calendar till 15.0.x. Who could have known that they blow up that basic core Calendar function :-(

Apple I'm not going to reset anything on my iPhone! You screwed it, so go and fix it, and please do that fast!

Well, that's by nature all Exchange, so corporate Exchange server, Office 365 and also outlook.com.

So, I have 2 of them running on my iPhone, since years w/o issues, Office 365 company account and also a personal outlook.com account. I would like to repeat myself, Apple go and fix that, and please fast, you screwed it.

I would be curious if Google Mail users are facing that issue, too, as Google used Exchange servers underneath the hood in the past. I'm actually not up to date, if they changed that already sometimes in the past ...

@PVcoach, what's the solution for, in removing an Exchange account that contains professional appointments? - Btw, my Google calendar doesn't work either. And Outlook was no solution too. Maybe except for people with some kind of burnout and wishing their work calendars may be unusable forever.

I prefer to use the agenda view, it allows for fast viewing of multiple days via scrolling, but that view now seems to have the worse staggering, delays, skips, and hesitations. Which all defeats the purpose.

I’ve been to the “genius” bar three times and they have no clue on what’s going on. The first time they replaced my iPhone 12 mini. The second time they told me to erase my phone and the third time I was told literally that “it is a little laggy but it still works.” I told the “genius” that it was an answer worthy of Microsoft. I’ve seen this issue posted all over the web, so now I know that it is not my issue. I hope they fix this as it is very annoying for people who use the iPhone for work. I’ll wait for a patch but in the meantime I’m getting an android to test it.

The point about the Android is that I have never tried it. I hear how IOS is so much better, but that may be a thing of the past; besides I am now curious of how bad it is when half the world uses it. You would expect some type of support from Apple for an expensive device that’s still in warranty. This lagging issue is in several threads around the Apple Forum and the web.

From my point of view I can deny any theory, sync period might the cause.

My default setting is ever since 2 weeks and I always just sync'd the calendar from one business Exchange account, so in words one calendar ever since only, not more. No change on that since roughly 12/13 years now.

What ever it is, it is not usable anymore after update to iOS 15.1, Apple has to fix that. Putting hands on a crystal ball just confuses everybody ...

I agree, but having addressed this with Apple multiple times, I can tell you that they are in denial. I hope that someone addresses the issue though. I have too much stuff that I have purchased but I’m so ****** that I’m considering Android.

Don’t know what Apple is thinking of in refusing to comment on this, lie to people at Genius Bar refusing to discuss the issue. I have moved all my iPhone and iPad apps to Google and hut off Apple access to analytics for Mail, Calendar, Maps …

There was a post in REDDIT about some sort of virus. I tried to go back to post the link here but I could not find it. Don’t know if it was deleted. If someone finds it, please share it. It seems our data is compromised. It also mentioned that it also affects many other apps like Chome for IOS. I don’t know if it is true, as I tried to go back to it and could not find it. I asked our IT guy and he was not aware.

I have the same issue across all of my iOS devices and on macOS. The issue started not right after the software update but just recently. Basically, I'm not able to use the calendar app at all. When I open it on macOS it starts consuming 100% of CPU until I force quit it. On iOS devices, it constantly freezes and crashes.

I didn't try resetting accounts, deleting them, etc. as I don't see it as a part of the solution.