iOS 15.1 Calendar app is laggy and unreliable

Same here and it's definately a calendar app bug.

I used a widget app (cal widget) to show all my calendars in weekly view, every item is in correct place with correct title.

Hopefully Apple can get this issue fixed in the coming 15.2 realease.

It looks like a solution will be rolled out in 15.2 - released imminently

This release also includes bug fixes for your iPhone:

·        

Siri may not respond while VoiceOver is running and

iPhone is locked

·        

ProRAW photos may appear overexposed when viewing

in third-party photo editing apps

·        

HomeKit scenes that include a garage door may not

run from CarPlay when your iPhone is locked

·        

CarPlay may not update Now Playing information for

certain apps

·        

Video streaming apps may not load content on iPhone

13 models

·     

Calendar

events may appear on the wrong day for Microsoft Exchange users

from

https://www.macworld.com/article/547488/ios-15-2-features-release-how-to-install.html

iPhone 13 / iOS 15.1.1

Have been experiencing issues like everyone else here since upgrade, with exchange calendar frequently displaying wrong event name in a time slot or displaying no events at all. Contacted Apple via chat last night and then received a call from a specialist to screen share where I demonstrated issues. She suggested the sync issue might be due to the app-layer Vpn as part of device management from my company.

Curious as to whether others on this thread have some kind of security suite, etc from the organization affiliated with their exchange accounts (work, school, etc)?

I’ve had issue. It’s total crap coming from apple. Removing vpn, company credentials does nothing

we await apple to release another upgrade. They have been totally useless on this incident. Not impressed one bit with apple after this mess.

Adding to this thread. I have 2 Exchange accounts, 1 Outlook.com account (which might as well be Exchange at this point), and an iCloud calendar someone shared with me. The Calendar widgets often fail to load or stay a day behind, and navigating the app is an exercise in patience.

jok713 wrote:

Curious as to whether others on this thread have some kind of security suite, etc from the organization affiliated with their exchange accounts (work, school, etc)?

Exchange (employer) and Gmail (personal) accounts. No VPN. No lag.

Curious as to whether others on this thread have some kind of security suite, etc from the organization affiliated with their exchange accounts (work, school, etc)?

Company Exchange account without VPN or other additional security suite.

Calendar quite useless with iOS 15.1.

Well_x3 wrote:

I waited to updated, but I just updated a couple days ago (12/5/21), and I am also having this exact issue, so it's not fixed yet. I live and die by this calendar! Hope it gets fixed!

Have you submitted feedback to Apple?

Meanwhile, you may want to try another calendar app.

I am not syncing multiple calendars and use Apple calendar exclusively. I, too, have been having issues with appointments not showing on my calendar since updating to 15.1. Entire weeks will be blank. I think it’s ridiculous to have to reset anything, especially since this was not an issue prior to the latest update. Grrrrr.

the solution that I found is to remove the app and use ms-teams to get notification for all the calendars I have. 3 exchange, 1 outlook, 1 yahoo, 1 gmail. the calendar consumes almost half the battery on my 11 pro probably due to the issues.

its working for me until calendar is fixed.

I just setup my iPhone 13 and so it was completely refreshed and I have this same issue. And I've found some events show the wrong subject and when opened display correctly. So confusing when you are managing a job and household of kids with multiple calendars and need to see all the calendars in one place. This works fantastic on my old iPhone 8. I'm utterly disappointed with apple.

Same thing here. Some subjects are wrong. I click and the content is right …. 🤦🏻‍♂️

totally unreliable.

I saw it refreshing the calendar contents once… but no reliable definition on how to mitigate this with native app so far…

I just bought a new iPhone 13 and upgraded to 15.1.1 (for some reason 15.1.1 was not available in Australia for my iPhone8 and current spec iPad air). The same problem comes up on the new device out of the box even though I assume the new device doesn't have a cache.

This was not an issue before upgrading to 15.1. Upgrading to 15.1 was the only thing that changed so I assume is where the problem lies.

Apple calendar for ios is now effectively useless. Such a shame.

I had the lagging o365 calendar issue for weeks 🤬but today I changed the no of days to sync emails on the o365 account in settings to 1 day - this changed the lagging and the performance is almost back to normal

I really like the iOS calendar app - I am sad that this bug exists and renders it useless for exchange users particularly. My simple workaround: I use another Calendar app like WeekCal or Fantastical - works! (Until an 15.x comes out and fixes the bug…