Apple notes lagging and disappearing

Hello Hulmerus,

This page can help provide some steps and suggestions that can help with the iPad running slowly: If your iPhone or iPad is running slow - Apple Support

If your device is low on storage, iOS or iPadOS automatically frees up space while installing an app, updating iOS or iPadOS, downloading music, recording videos, and more. iOS or iPadOS only removes items that can be downloaded again or that aren't needed anymore.

You can check your device's storage in Settings > General > [Device] Storage. For best performance, try to maintain at least 1GB of free space. If your available storage is consistently less than 1GB, your device might slow down as iOS or iPadOS repeatedly makes room for more content.

Turn off Low Power Mode

Low Power Mode is an iPhone and iPad feature that extends battery life by reducing the amount of power that your device uses. In Low Power Mode, some features are turned off and some tasks might take longer to complete. If your battery icon is yellow, Low Power Mode is on.

Get more help

• A touch screen that responds to taps incorrectly can make your device seem slow. If you think that your touch screen isn't responding correctly, try restarting your iPhone, iPad, or iPod touch. If that doesn't work, and the issue occurs in the same area of the screen in multiple apps, you might need to contact Apple Support.

Cheers.