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I am a longtime user of the iOs "Reminders" app. And I most commonly create new reminders through Siri, for example by saying "Remind me to pay the rent at 6pm."

These Siri requests started taking a slow, long time to actually create the reminder.

  • I would make the Siri request, and then Siri would say things like "I'm on it," "Wait a moment," etc.
  • A very long delay would pass. It would take up to 15 seconds before it would act.
  • Then, it would actually even fail about 15 percent of the time, saying "Sorry, there was a problem with the app."
  • A side issue that is truly a bug but not the point of this post is that, after the Reminders app was approved in iOS13, my default reminder list appeared totally blank when viewed in the web-based iCloud reminders app. (It was OK (after an initial delay of several days) in actual mobile devices and in the macOS app.)

What caused this slowness problem, and how to fix?

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  • Since ios 13 was released, the icloud reminder web version has been slowing down either. Don't understand! Nov 21, 2019 at 8:51
  • Is it possible that you have a reminder list with many many old reminders in it? See the solution to my question ---- it was because my list had 8000 items. Nov 21, 2019 at 9:26
  • No. just about 30-40 items only. Since ios 13 was released, the remider web version's asynchronous loads very very slow :( Nov 24, 2019 at 23:06

3 Answers 3

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The fix to this problem is due to the fact that the reminders list that it was attempting to add to (... which is the one that was configured in iOS as the "Default reminders list") was a very old and very full list. It was not super full of un-completed reminders, but the number of past COMPLETED reminders was over 8,000.

So, to fix the slowness, I simply created a new reminders list in my iPhone. Then I configured this new reminders list to be the "Default reminders list."

After that point in time, Siri commands to create new reminders work smoothly and quickly. (AND, related to that final bullet, this new reminders list was fully visible, not empty, in the iCloud web app.)

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Following @jon worek’s answer, deleting old completed reminders is easy on iPhone as well.

On iPhone with iOS 15

  • Go to the list of all reminders: All
  • Tap the three dots menu at the upper right and Show completed reminders
  • Next to the count of completed reminders is the option to 'clear' them. Tap Clear and it will give the option to clear all of them or reminders older than a month and so on.
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The accepted answer of creating a brand new list is a great suggestion.

I was also able to get the same effect by deleting all of the old, completed reminders from my list (I had about 4k+).

I did this on my Mac, which was simplified by being able to multi-select and delete a bunch of reminders at a time. It probably wouldn't work as well on an iOS device though :)

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