Clean my Mac has been known to cause problem. Such apps are not needed too. I would uninstall them using the developer's instructions.
You just installed Monterey yesterday and after an upgrade the new OS has to disk indexing and other things which slow the computer. I can see this since MDworker is taking CPU and that is the Spotlight search indexing.
Is Disk0/1 you startup disk? It is internal?
disk0 - CT1000BX500SSD1 1.00 TB (Solid State - TRIM: No)
Internal SATA 6 Gigabit Serial ATA
disk0s1 134 MB
disk0s2 - EFI (MS-DOS FAT32) [EFI] 210 MB
disk0s3 [APFS Container] 980.00 GB
disk1 [APFS Virtual drive] 980.00 GB (Shared by 6 volumes)
disk1s1 (APFS) [Core Storage Container] (Shared - 15.69 GB used)
disk1s1s1 - Macintosh HD (APFS) (Shared - 15.69 GB used)
disk1s2 - Preboot (APFS) [APFS Preboot] (Shared - 312 MB used)
disk1s3 - Recovery (APFS) [Recovery] (Shared - 1.10 GB used)
disk1s4 - VM (APFS) [APFS VM] (Shared - 9.66 GB used)
disk1s5 - Macintosh HD - Data (APFS) [APFS Virtual drive] (Shared - 313.79 GB used)
disk1s6 - Update (APFS) (Shared - 2 MB used)
- I note that TRIM is not enabled and that can slow disk operations. Etrecheck notes:
SSD too slow - SSD is showing poor performance.
Did you replace the original disk?
What is this disk:
disk7s1 - Macintosh HD
980.00 GB (Shared - 15.69 GB used, 729.79 GB free)
APFS
Mount point: /Volumes/M************1
Owners enabled: No
Read-only: Yes
disk7s5 - Macintosh HD - Data
980.00 GB (Shared - 224.31 GB used, 729.81 GB available, 729.79 GB free)
APFS
Mount point: /Volumes/Macintosh HD - Data
Owners enabled: No
I ask since a disk titled Macintosh HD is usually the startup disk.