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Before this change, turning VSync off did not actually uncap your frame rate. The game ran in borderless fullscreen, where Windows' desktop compositor owns the display pipeline and applies its own VSync regardless of what the game asks for. So on a 240Hz monitor with a GPU that could draw 800fps, you still only saw 240 frames per second and the other 560 were thrown away. Worse, the frames you did see were up to a refresh cycle stale by the time they hit your eyes, which is input latency you can feel when moving the camera or aiming. Fullscreen now uses true DXGI exclusive mode, where the compositor is out of the way and the swap chain writes directly to the display. Every frame the GPU produces lands on screen as soon as it is ready, so "VSync off" actually does something. Expect FPS to climb well past your monitor's refresh rate and the mouse to feel noticeably more responsive. Exclusive fullscreen also displays at your monitor's native resolution with no driver-side scaling or filtering. The backbuffer is grown to match the monitor exactly before the transition, and the display mode is pinned to the backbuffer size so nothing in the output pipeline resamples your pixels on the way to the screen. The result is a crisp 1:1 image with none of the softening or greyish filter that stretched output can introduce. Yes, this is the mode where screen tearing can happen. Tearing gets a bad reputation but it is a visual tradeoff, not a bug, and many players prefer it over the latency VSync causes. If you want to avoid tearing, just turn VSync on in the settings and the game will cap cleanly to your refresh rate. You now have a real choice between the two instead of "off" quietly being broken. Under the hood, F11 and the saved fullscreen preference both route through a new ApplyExclusiveFullscreen path that does Microsoft's recommended transition: grow the window to cover the monitor, ResizeTarget with no scaling so the display mode is pinned to the backbuffer size, SetFullscreenState(TRUE), SetColorSpace1(sRGB), then a second ResizeTarget so picky drivers actually apply the mode. Exit forces a real decorated windowed state so F11 cycles cleanly between windowed and exclusive fullscreen. ResizeD3D skips its swap-chain-recreate path while in exclusive mode so it does not fight DXGI for ownership. The swap chain's RefreshRate changes from a hardcoded 60Hz to 0/0 so DXGI matches the current display mode. Fixes an "input signal out of range" error that could happen on high-refresh monitors after entering fullscreen, where the monitor was being asked to renegotiate timing off of 240Hz down to 60Hz on every launch.