Microsoft has started officially testing a new Game Mode feature in Windows 10. From a report: Traces of the new option were found back in December, but the most recent test build of Windows 10 (15007) includes Game Mode in the Xbox app. MSPoweruser has supplied some screenshots of how you can enable the option, but Microsoft has not yet officially unveiled Game Mode for everyone to test. Microsoft's description lists the feature as a mode to let a PC make gaming the "top priority to improve your game's quality." It's still not clear exactly how Game Mode will improve gaming performance, but it's likely that Windows 10 will simply suppress system processes and other apps from taking too many CPU, GPU, and RAM resources away from the primary game being played.