Harmful misconceptions in Launch Options and Console commands/arguments for Source Engine based games in Articles and troubleshooting Posted February 8 20 hours ago, capofantasma97 said: Launch options and commands that affect window/fullscreen modes and resolutions like -noborder -fullscreen -w -h -full -sw are to be avoided if possible because they may cause "confusion" in the engine and create performance issues. Plus it will conflict with any changes applied in the game settings. For this kind of settings, video options in the game's settings should be the only way to interact with them. Almost all games have a selectable borderless windowed mode. Nonsense.... citation needed. The only way I can see it cause any performance issues, is when the render width or height exceeds desktop space, but that's API related performance issue and not exclusive to Source.