Game Mode will be available in the next Windows Insider build.
“Game Mode will work both with UWP games as well as Win32-based games,” Kevin Gammill, a partner group program manager for Xbox, told me in an interview on Tuesday. “I will say that it’s likely that we’ll be able to eke out a little bit more performance on the UWP side with some games, essentially because of the way Win32’s architected vs. the way UWP’s architected. Specifically, there’s no way at the platform level to really know where a game starts and stops…. You could have a number of Windows services running, we don’t know if that’s part of the game or not, that the game’s calling into. UWP is more of a contained package, and you know where it starts and stops. Knowing what the contained package is may be of some extra benefit, may be slightly better than Win32 from a performance perspective. But no question, Game Mode can see huge perf benefits for both Win32 and UWP.”
“Depending on your machine configuration, what software you have running on the machines, what system services you have running, you could have threads running across all your cores making the machine relatively hot,” Gammill said. “And then when you have a game running on top of that, depending on how the game is architected, sometimes those threads can contend from a resource perspective with what’s going on in the system. So essentially what we’re doing with Game Mode is allocating a number of threads that will be for the game only, and the rest of the threads for the system only.”