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Designed to give "Borderless Windowed" mode the same performance as "Exclusive Fullscreen."

In older versions of Windows, "Fullscreen Exclusive" (FSE) gave a game complete control over the display, which maximized performance but made slow and buggy. "Borderless Windowed" mode allowed for instant switching but introduced input lag and forced V-Sync through the Desktop Window Manager (DWM). fullscreen optimizations on or off