Why is my Mac Slow after Big Sur Update?

MacOS Big Sur Slow? Fixes Here

One of the most common reasons for any computer getting slow is having way too much old system junk. If you have too much old system junk in your old macOS software and you update to the new macOS Big Sur 11.0, your Mac will slow after the Big Sur update.

How do I Speed up my Mac Big Sur?

1: Slow Mac right after macOS Big Sur update? ...
2: Check CPU Use in Activity Monitor for Apps, Processes, etc.
3: Consider Your Messages.
4: Disable Window Transparency & Use Reduce Motion.
5: Clean Up a Cluttered Desktop.
6: Install Available macOS Updates.
7: Update Mac Apps.

Why is my Mac so Slow all of a Sudden 2020?

Your Mac needs adequate drive space to function efficiently. Your system becomes sluggish when it gets too close to full capacity. To check your Mac's available storage space, go to the Apple icon, select About This Mac, then click on the Storage tab. To free up space on your drive, click on the Manage button.

Why is my Mac so Slow all of a Sudden 2021?

You may have resourceheavy apps running in the background, out of date software, slow powerup, a lack of hard drive space, or just be in desperate need of a hardware upgrade, Whatever the reason, we have a few suggestions here that might help get your Mac moving faster.

How do I Undo MacOS Big Sur Update?

Click on the Apple logo and select Restart from the menu.
Hold down Command + R to reboot in Recovery mode.
Open Disk Utility > Continue.
Select your Startup Disk > Erase.
Select APFS or macOS Extended format and confirm your action.