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Why is my Calendar app lagging on iPhone 15 Pro Max?

Using an iPhone 15 pro max and with the new iOS18 there appears to be a substantial lag in the load time of the calendar app. It’s very sluggish in its response times. Anyone else experiencing this and any solutions to help the calendar app work better?


[Re-Titled by Moderator]

Posted on Sep 25, 2024 3:45 PM

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Question marked as Top-ranking reply

Posted on Sep 26, 2024 8:56 AM

Yes, something’s not right with the calendar. For example, if I have to make an appointment, and then I go and check to see if I have anything else booked at that time in my calendar, at first it will show a clear calendar, but then afterwards a few seconds later or at some point, my calendar will load with all of my appointments. This is causing me to double book things and overall frustration. They gotta fix this thing first before anything else. Gonna mess up a lot of people schedules.

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Question marked as Top-ranking reply

Sep 26, 2024 8:56 AM in response to Reb4Life

Yes, something’s not right with the calendar. For example, if I have to make an appointment, and then I go and check to see if I have anything else booked at that time in my calendar, at first it will show a clear calendar, but then afterwards a few seconds later or at some point, my calendar will load with all of my appointments. This is causing me to double book things and overall frustration. They gotta fix this thing first before anything else. Gonna mess up a lot of people schedules.

Sep 25, 2024 5:38 PM in response to Reb4Life

The calendar app is just fairly dumb program that displays data delivered by the calendar server, so if there is a delay it is between the server and your iPhone. Calendars are stored on your email account or accounts, and sync to the iPhone.


Check your connection speed, and if you use VPN delete the VPN profile in Settings/General/VPN & Device Management/VPN. Don't just turn it off; delete the profile, as it is a very common source of communication delays.

Why is my Calendar app lagging on iPhone 15 Pro Max?

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