CS GO Settings:

Sound:
Go To sound, Communication and set "do Nothing"
snd mixahead 0.05

use newest sound drivers

Fps:
Workshop maps should be removed
verify integry of game cache
Run autoexec
Set processor affinity:

 1. Open up Task Manager, and click on the Services Tab...
2. Find the AudioSrv & AudioEndpointBuilder services and note their PIDs (should be 2 different ones)
3. Now got to the Processes tab, find the corresponding PIDs (both svchost.exe), right click, set priority to Realtime. right click them again, and Set Affinity to CPU 0 only.
4. Repeat step 3 for the audiog.exe process aswell.
5. Run CS:GO, back to task manager, and set csgo.exe Affinity all other CPUs except 0. (Leave the priority on normal)