Macbook dead slow after Big Sur update 11.5.2 (20G95)

Start with this...

Delete these files & restart...

~/Library/LaunchAgents/com.epicgames.launcher.plist

~/Library/LaunchAgents/org.virtualbox.vboxwebsrv.plist

~ tilde indicates  your home folder

Apple hid the Users' Library folders...

Method 1:

1. From the Finder, select the Go menu at top of the screen, and choose Go to Folder.
2. In the window that opens, enter ~/Library, and click Go.

Safe Boot, (holding Shift key down at startup). Could take 10 minutes.

Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.

How much free space is on the Hard Drive?

Have you emptied the Trash lately?