MacBook Unusably Slow

Are there any AntiVirus, Disk Cleaner, Optimizers, Un-installers, etc installed which should be removed as per Developers Instructions. They are useless, unneeded, cause havoc and interfere with the normal operation of the OS and may even Corrupt the OS requiring a Reinstallation. The Built-in Security of Big Sur is all that is required.

Any Third Party Applications that will interfere with the normal operation of the OS, alter, modify, remove or delete or attempt to do so is an invitation for disaster and may require a Reinstallation of the OS.

Not much information to go on, but I suspect that your internal drive may be failing.

You could try installing a clean OS on an external drive and seeing how your mac performed.

Also: try starting your mac in Recovery and running Disk Utility to check your internal drive

Hello, areynaldos.

Maybe we can figure out what’s going on with your Mac.  It could be anything from a simple malware installation to a hardware failure. Some things are fairly easy to fix.

You should start with an EtreCheck evaluation of your Mac.

EtreCheck is a diagnostic app that gathers and reports important debugging information about your Macintosh. It is very highly regarded and meant to be used with Apple Support Communities to help others help you troubleshoot and resolve your Mac problems.

Please navigate to EtreCheck.com and download the free version of EtreCheck. Once you’ve run the app and created your report please post it with your reply to this message. 

You must upload the full report. For instructions on how to attach your EtreCheck report to your reply, please click  How to use Add Text when posting…

We can use the EtreCheck report to look for the more obvious things that may be causing your problem and advise how to correct them.

The issue appears to be Lack of Empty Space on the internal drive and is so very busy swapping things into and out of Memory because the drive is running out of Empty Space.

Good practice is to keep at least 15 GB of empty space on the drive at ALL TIMES. Not doing that will eventually exhibit what this computer might be experiencing. If this is correct - the computer should show a Warning Message " Disk to too Full " or Disk is " out of space ". If left not corrected - the computer will eventually Stop Booting at ALL.