macbook pro M4 barely usable (extreme lag, bird, file provided).

MacBook Pro 14″, macOS 15.5

To trouble shoot further you can:

—A SafeBoot Start up your Mac in safe mode - Apple Support will sort many anomalies

Does a quick disk repair before it fully boots up, and certain system caches get cleared and rebuilt, third party system modifications and system accelerations are disabled temporarily.

Login and test. Reboot as normal and test. Caches get rebuilt automatically.

This test will tell you if third party interference; most extensions etc are not loaded in safe boot mode.

—Test issue in another user (or guest user) account Change Users & Groups settings on Mac - Apple Support

This will tell you if it a universal issue or isolated to your user/admin account. 

***wireless keyboard with rechargeable batteries— connect the charging cable, this will make the wired keyboard successful Safe Boot your Mac.

unplug all non-essential peripherals when testing

Uninstall all third party apps that are Cleaners/Optimizers/VPN/Anti-Virus

all known to cause issues on the macOS

the current Sequoia is 15.7.2

the current Tahoe is 26.1

verify your software is up to date—

Keep your Mac up to date - Apple Support

By far the easiest way to cause poor performance, instability, overheating and crashing is to install ANY third-party speeder-uppers, Cleaners, Optimizers, Virus scanners, Bit Torrent, or a VPN that you installed yourself.

¿Are you running anything like that?

if you are, I suggest you remove it at least for testing, and preferably permanently.

Let readers know what you find out for additional things to try.

Install and Un-Install

the fundamental principles:

• anything installed with drag-and-drop to the /Applications folder can be un-installed by Drag-and-drop to the Trash. After a restart, the Trash can be emptied.

• anything installed with a complex installer program requires the manufacturer's un-installer program. sometimes this is included as an "option" in the Installer package, but the software-maker's web site should specify how to un-install (if they don't, they get swamped with users clamoring for Un-install Instructions).

DO NOT use any other web site’s instructions, unless you have complete trust in that specific site to tell you the truth.

Third-party un-installers could be malicious. The Classic case is malicious updaters for Flash Player.

• anything claiming to be an 'uninstaller helper' is just JUNK. (worse than web site click-bait)

Remember that you can not immediately DELETE anything hat is part of the running MacOS, because if it were referenced after being deleted, your Mac would crash. What you can often do is Move to Trash, and after a Restart, the item will no longer be part of the running MacOS and the Trash can be emptied.

the damage done by an App un-installer removing more than intended is very difficult to recover from, and may require a MacOS re-install.

Éléments Ouverture:

[Pas engagée] AppCleaner SmartDelete (Julien Ramseier - installé 2025-07-13)

Élément d’ouverture moderne

/Applications/AppCleaner.app/Contents/Library/LoginItems/AppCleaner SmartDelete.app