There's still not a lot that can be done with the game right now as it is in the beta stages. There's no FPS improving commands that we're aware of but we have still put together a small config for those who have been asking.
The commands included make the game more closely emulate Source, removing the bobbing and changing the placement of the gun models.
In addition it also includes the correct interp settings to ensure that there's the recommended netcode settings for optimum competitive play online.
We're going to be updating our config as more and more commands become available to us but for now this should ensure the best game experience possible.
You can download the config file here
Once downloaded paste the config here, altering where appropriate for your OS or any form of custom install: C:\Program Files (x86)\Steam\steamapps\common\Counter-Strike Global Offensive\csgo\cfg