Half-Life 2 Performance Tips
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Enabling the Console in Half-Life 2 Deathmatch
By default, there's no access to the console when playing HL2DM. To enable it, right-click on Half-Life 2 Deathmatch in the Steam menu and select Properties. Then click on the Launch Options button. Enter "-console" (without the quotes) in the options box. See the following screen shots for an example.
Once the console is enabled, you can hit tilde (~) to bring down the console. Hit ~ again to get rid of it.
If you're already in the game, you can do
Or, you can simply add the following line to your config.cfg file: