If you experiencing strange mouse movements, and you feel that "something is off" with your sensitivity; turn off "Fullscreen Optimizations" in the Compatibility Tab of the csgo.exe properties. : r/GlobalOffensive
How to Fix Mouse Lag in Windows 10 Easily - REGENDUS
CS:GO Ultimate Mouse Lag Fix!! (2021) 100% Working - YouTube
If you are having performance issues / stuttering in CS:GO after the Windows 10 Fall Creators Update, try these potential fixes : r/GlobalOffensive