• Open the Steam client
  
• Navigate to Library tab
  
• Right click Dota 2
  
• Select Properties
  
• Navigate to General tab
  
• Click Set Launch Options...

+con_enable 1 Enables the console on startup.
-console Enables the console in-game.
-high Gives Dota 2 priority CPU usage.
+fps_max # Set the maximum frame per second to the number that has been assigned.
-autoconfig Restores video and performance settings to default for the current hardware detected. Ignores settings inside any .cfg files until this parameter is removed.
-safe_mode Restores rendering API used (DirectX 9, OpenGL) to default choice. Ignores settings inside any .cfg files until this parameter is removed.
-nod3d9ex Disables Windows Aero DirectX extensions; may improve performance in certain cases.
-nomicsettings May help people with issues in third party communication software, such as Skype, in which their microphone volume would get maxed upon launching the game.
-map dota Loads the Dota 2 map right when you launch the game. Helps load times after you find a game since you no longer have to load the map then.
-dx9/dx11/vulkan/gl Force to run chosen rendering API.
-novid Skips the intro.
-noprewarm Disable prewarm resources loads.
Prewarm turn on by default, loads many resources needed to play a match of Dota before the dashboard appears and should make the time spent loading resources during connection much faster, especially on low-spec machines. The trade-off is that the initial load time before the dashboard will be a little longer.
-h <height> Forces the engine to start with resolution set to <height> value in pixels. Ex: -h 768
-w <width> Forces the engine to start with resolution set to <width> value in pixels.
-32bit Force run on 32bit client.
-fullscreen Set display mode to full screen mode.
-noborder Set display mode to borderless window mode.
-sw Set display mode to windowed mode.
-useforcedmparms Allows the use of -noforcemspd and -noforcemaccel.
-noforcemaccel Use the Windows mouse acceleration settings.
-noforcemspd Use the Windows mouse speed settings.
-sdlaudiodriver directsound
-sdlaudiodriver winmm If you're having a problem where Dota is playing no sound, please try adding one of these above.
-gamestateintegration A command line option to enable Game State Integration (now disabled by default).

-nomousegrab Enables alt-tab function in some Linux desktop environments (such as XFCE) where Dota 2 is running fullscreen and grabbing the mouse wouldn't allow users to alt-tab out of the game.
-language Changes the language of the game strings and menu, e.g. "-language italian".
-nexon Adds the South Korean server to your search options if you have a Korean Nexon account.
-perfectworld Allows you to play on Chinese Perfect World servers.
-nogammaramp Forces Dota to use desktop color profile.
-antiaddiction_test Adds an uptime clock.
-cursor_scale_percent # Able to change cursor size. Default 100. Overrides the setting in the in-game options if used.
-port No information. Probably changes the network port of Dota 2 client.
-forcedownloadbannedwords No information. Most likely, this option is download the list of banned words from Steam filtering system to Dota 2 to censor words that you set.

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