Launching Without Background Maps
From Valve Developer Community
Running the game with the
-console launch parameter will prevent it from loading background maps. There are three ways to do this:
- Create a shortcut to the game's executable, and add the parameter after the path in the shortcut properties.
- If you are launching the game through Hammer, you can add this to "Additional game parameters" in the Run Map dialog.
- in your Steam library, right-click on the game and Choose Properties. Click the "Set Launch Options" button and add
-consoleto the text field.