Computer lags, decided to check the disk?

Question

Solid State Drives

Checked the disk for speed in crystaldiskmark and angered the small values ​​in the read column. Hard disk, PC lags (works slower than usual at times)

Answer 1

Try checking disk integrity. Maybe he is dying.
https://remontka.pro/check-ssd-errors-smart/

Answer 2

Disable sysmain, windows search, updates, built-in antivirus in services.
Then check if the PC is lagging.
Process loaded? How?
RAM? How much is it?