-allow_third_party_software
Allows you to use third party software and turn offs trust mode

------------------------------------------------------------------------------------------------------
-noubershader
Users on very old Intel hardware can set this launch option to improve their framerate. This option is not recommended otherwise as it is likely to cause stuttering on the overwhelming majority of GPUs.

-console
This will enable the console as soon as you get into the game. It’s useful for making sure your config files have loaded properly, but unlike with Counter-Strike: Source isn’t required to make the console show up when you press its hotkey (more on this later).

-novid (doesn't work in cs2 for now)
Turns off the Valve intros, saving you precious seconds every time you boot into the game

-high
Gives the game high priority in your CPU, meaning background tasks won’t slow it down as much. Useful for keeping web browsers running on a second monitor while playing. Messing with CPU priority isn’t a risk free operation, but is unlikely to damage anything permanently. Try disabling this command if you’re getting bluescreens.

-refresh "number" / -refreshrate "number" / -freq "number"
With this command you set how much FPS you want to see.( is better to put at maximum refreshrate !!!)

+fps_max 0 – Sets your fps to max.

-threads [number of cores/threads]
Tells the game how many CPU cores it has access to. Recommended to set this to however many cores your computer has (probably 4). Exactly whether this will improve or decrease your performance is specific to your computer, so enable or disable this command as necessary.

-tickrate [number] " 64 or 128 "
Valve turned off 128 tick

-full / -fullscreen
Loads the game in fullscreen

+mat_queue_mode 2
Enables multi-core rendering.

+cl_forcepreload 1
Gives a small fps boost (Instead of the game loading textures into memory when it needs them, it loads them automatically when you load the map.)

-w [width] -h [height] -x [horizontal position] -y [vertical position]

So if you wish to have a window that fills a second 1080p monitor, you would use this string of commands: -h 1080 -w 1920 -x 1921 -y 0.


-language [language]
This forces the client into a certain language. Useful if you want it in English but have a non-English Steam client