Think of it like a movie director layering CGI over a green screen. The game renders, the UI renders, the OS renders; then the compositor blends them all. This takes time, usually one full frame (16.6ms at 60Hz) of latency. Viewerframe Mode Exclusive (often labeled simply as "Exclusive Fullscreen" or "Hardware Overlay") bypasses the Window Manager entirely.
A: Use MSI Afterburner + RivaTuner. If the overlay occasionally flickers, you are in exclusive. If it's stable, you are in borderless. Alternatively, check if dwm.exe renders over your game. viewerframe mode exclusive
Your monitor shows you the world; Exclusive mode ensures the world you see is as recent as physically possible. Q: Does Viewerframe Mode Exclusive increase FPS? A: Not directly, but it reduces latency and GPU composition overhead, which can smooth out frametimes and feel like higher FPS. Think of it like a movie director layering
A: Yes. At worst, you will experience slow alt-tabbing. It cannot damage hardware. If it's stable, you are in borderless
If you are chasing every millisecond to win that clutch round, or if you are battling stutters in VR, dive into your settings. Turn off Fullscreen Optimizations. Kill the overlays. Seize the viewerframe.