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It's only supposed to be used for games, but you can activate it whenever you need to get a little burst of speed. To enable Game Mode (it's only available in Windows 10 Creators Update) open Settings > Gaming and choose Game Mode. However, you must first enable Game Mode.
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There's no way to perpetually run in Game Mode, unfortunately, but you can activate it by pressing Windows Key + G. The latest version of Windows 10, the Creators Update, adds a new feature known as Game Mode.
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