Severe mouse lag when screen mirroring

rexamxal Said:

"Severe mouse lag when screen mirroring: It is not my mouse that is lagging, it is my cursor. I would expect good copy/pasted suggestions to include:

1. Nothing to do with hardware, as this is clearly a software problem.
2. Related to screensharing only.
3. Related to a specific user account."

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Troubleshooting a Lagging Mouse:

In relevance to the Above.

1. Don't mistake the my use of the word "Mouse" for "Cursor". I'm referring to the cursor.
2. If you think that it is the hardware, then reinstalling the macOS***
3. If you think it is related to a specific user account, then create anew one.

***Reinstalling the macOS:

Sometimes, changes are made to your Mac (i.e. uninstalls), and then settings (i.e. for power), become manipulated, technically. So, reinstalling the macOS with place moved items back to where they should be, and will replace damaged system files.

1. First, Back up your Mac:

Create a Time Machine backup of your Mac, so that you can have something to restore your Mac from, should anything go wrong with the reinstall.

2. Then, Reinstall the macOS:

Nothing would be deleted. It's just that items that have become corrupted or deleted, would be replaced or reinstalled back to where they should be. Go Here: How to reinstall macOS from macOS Recovery - Apple Support

rexamxal Said:

“If you don't work for Apple, thanks for going out of your way to try to help. I will use your information to debug the problem.”

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You are welcome. Glad to have helped.

No. I do not work for Apple. I am just an everyday Apple user like yourself.

You can provide your feedback to Apple here: Feedback - MacBook Pro - Apple

Reinstalling the macOS would fix glitches and any bugs in the software. So, I recommend you give it a go, backing up first, prior to doing so.

rexamxal Said:

"Severe mouse lag when screen mirroring: I have two user accounts. One user account has severe cursor lag which renders the screen mirroring experience unusable.[...]"

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Troubleshooting a Lagging Mouse:

A. Verify Compatibly:

If incompatible, it is not expected operate as desired.

B. Try Safe Mode:

In Safe Mode, login items do not run, and corrupt system files(i.e. caches) are intentionally reset as a way to fix issues

1. Boot: in to Safe Mode: [Hold Down: shift key upon boot].
2. Log in: as same user
3. Wait: 30 seconds
4. Restart; your Mac
5. Log in: as same user

C. Remove Login Items:

While in Safe Mode, remove all of your Login Items, and then restart the Mac.  Go Here: Change Users & Groups Login Items Preferences on Mac - Apple Support