"Full-screen optimization" is a Windows feature designed to give gamers the best of both worlds: the high performance of mode and the convenience of Borderless Windowed mode.
: In some cases, FSO may prevent Windows from correctly prioritizing the GPU over the CPU, leading to lower-than-expected frame rates. Reddit +5 Performance Comparison Feature Fullscreen Optimizations (Default) Fullscreen Exclusive (FSO Disabled) Alt-Tab Speed Instant Slow (with black screen) Overlays Native support (Game Bar, Volume) Limited or may cause crashes Input Lag Very low (in modern titles) Potentially lower in older titles Stability Generally stable for modern APIs Better for legacy/retro games How to Disable Fullscreen Optimizations If you are experiencing performance issues, you can disable this feature on a per-game basis: Locate the game's executable ( .exe what is disable full screen optimization
🛑 Stop randomly clicking that setting! Here is what "Disable Fullscreen Optimization" actually does in Windows: "Full-screen optimization" is a Windows feature designed to
By default, Windows uses "Full-Screen Optimization" (FSO) to run games in a mode that looks like "Exclusive Full-Screen" but technically functions like "Borderless Windowed" mode. Here is what "Disable Fullscreen Optimization" actually does
❌ – True exclusive full-screen can take 2–5 seconds to tab out instead of instantly. ❌ Broken overlays – Discord, NVIDIA ShadowPlay, or game launcher overlays may not appear. ❌ Multi-monitor glitches – Mouse may get trapped on the game screen, or second monitor dims. ❌ No benefit in borderless windowed – If you play in windowed mode anyway, this setting does nothing.
🎮 "Make game go faster." 💻 What it actually does: It turns OFF Windows' modern screen handling and forces "Old School" Exclusive Fullscreen mode.