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

Sorry my message got cut off. As a temporary solution you can call on Siri to pop up your calendar and enter meetings or view your day or view your day. It’s not the permanent solution but it will get you through until Apple fixes this hopefully soon

Just got off Apple Support. They had me do a Network Settings Reset, which helped some. The app opens more responsive, and the Day view is better but the List View is still very laggy.

Got iOS15.2 offered for my iPhone6s.

Installed, Calendar issue fixed!

I have iPhone 13 and same problem. Calendar is chuggy, slow to respond, scrolling is aweful. I don’t really have this issue on my iPad, and it started right after the 15.1 update. I had 15.02 and this wasn’t a problem.

I'm facing that issue too, with Google.. As soon as I add the account to calendar, the app first seems to have to do a lot (wheel spinning), no scrolling possible, and after about 10 sec it crashes.

I have just done a diagnosis session with Apple Support, they will forward the data to development and analyze.

I have found that Calendar is now sucking huge amounts of battery in "background activity" - it used almost 3x as much battery in 30 minutes in background activity as the same time I was actively scrolling through FB (72% vs 27% respectively). In one hour period it chewed through almost 30% of total battery charge...

well sharing with Apple or sharing with Google all the same. I have one Gmail personal, one Gmail enterprise, and two Outlook calendars that I need to sync up, Google calendar for iOS and iPad do a great job they found them all instantly and the UI in Google calendar app is much nicer than legacy Apple app.

If Apple won't even respond to the issue then I'm done with their apps forever

I have this problem as well on both iPhone 12 & iPad after upgrading to 15.1.1 - that said, I discovered today that it only happens when I'm on WiFi. If I'm on cellular, there's no problem. Not sure why the difference. Doesn't matter what WiFi network I'm on (home/work/public). But I've started to turn off my WiFi on my iPhone when I need to access/view the calendar. Not ideal, but a workaround until Apple can fix this with the next software update.

Meanwhile this alternative app Senna not to have any issue: https://www.devart.nl/calalarm/index.html

Also Microsoft’s Outlook seems to work fine (but I don’t like it very much).

iphone 11 Pro. ios 15. Outlook exchange and Google calendars. Can only fix if force quit calendar. Stopping and restarting calendar in account settings did nothing. This really is unacceptable.

15.2 seemed to work and fix it but it still cost me a ton of contacts.

Jboomsma wrote:

15.2 seemed to work and fix it but it still cost me a ton of contacts.

I have 1129 Exchange contacts and they all show in my iPhone.

How many contact do you have?

That’s what I find too. When you change dates it’s like they overlap. I can’t trust what I see and until I touch the calendar entry does it refresh and show the proper appointments. It sucks big time.

Creating a new appointment is almost impossible.

After entering the first letter in the title, the calendar hangs for 20-30 seconds. If you still enter further letters, they appear only after these 20-30 seconds. If you click on another field (place or time) the calendar hangs again for 20-30 seconds. Thus it takes 5 minutes or longer until an appointment is created.

Furthermore, the appointments are often not displayed correctly in the day view. Often not correct titles are displayed, titles of other appointments. If you touch this title, it jumps to the correct title and if you touch it again, the wrong title is displayed.

I have the problem after the update to 15.1 on my iPhone 12 Pro max and on my iPad Pro. My wife also has the same problems on her iPhone XS max after the update.

Unfortunately, restarting the device does not remedy the situation.

The calendar is currently unusable !!!!

I have the same issue with a XS. The calendar is extremly slow, it is a pain to do anything with it. I have to wait for 20-40 seconds just to respond to any scroll or tap on any buttons. It was fine before iOS 15. Please fix this issue urgently, because it is ridiculous, that such a basic function is unusable.