When you are in your Steam Library, right click on 'Counter-Strike: Global Offensive', go to 'Properties' and under the 'General' tab, click on 'SET LAUNCH OPTIONS...' and add what is listed above in the top left corner into the box. I can actually play CS:GO now without having to make Bread hear me get mad over me having FPS drops and stuttering.
For the lazy people:
Code:-high -novid -threads 4 -freq 60 -nod3d9ex -nojoy