Description

why does windowed fullscreen lower fps ?

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### Why Your Game Might Run Slower in Fullscreen — and How to Reverse It (2023 Guide)

**Introduction**

Picture this: You’ve configured your gaming PC to its peak, but when you switch to fullscreen, your FPS nosedives. Is your brand-new GPU failing, or is there a deeper mystery at play? As forums and tech threads show, this issue confuses many gamers. But don’t panic—this problem’s origins are both technical *and* surprisingly human (yes, blaming drivers). Again).).).).).).).). ). Let’s unravel why windowed mode *sometimes* trumps fullscreen, and how to fix it.

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### Why Windowed Mode *Can* Outperform “Fullscreen”
Before diving in, let’s clarify two categories of display modes (because confusion starts here):

1. **True Fullscreen:** The game claims total control over your GPU and display, with no OS window borders or taskbar.
2. **Borderless Windowed:** A stretched, windowed mode that tricks your brain into thinking it’s fullscreen (but technically runs as a window).

Here’s why windowed modes might outperform true fullscreen today:

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### Key Factors Behind the FPS Drop

#### 1. **Windows 11’s “Optimizations for Windowed Games” Feature**
Ah, the elephant in the room. Microsoft’s 2023-era Windows 11 [added a setting](https://support.microsoft.com/en-us/windows/optimizations-for-windowed-games-in-windows-11-3f006843-2c7e-4ed0-9a5e-f9389e535952) that boosts performance in *windowed* games by lowering background processes’ resource grabs, allocating your GPU’s attention to the windowed app. If this is enabled, windowed modes run smoother—but if *disabled*, fullscreen might suffer.

#### 2. Outdated or Faulty Drivers
The most common culprit! As Reddit user [@GeneralCalobe](https://www.reddit.com/r/wow/comments/kaebic/l…) noted: corrupted drivers or outdated GPU software can misconfigureFullscreen mode, forcing the GPU into inefficient modes. For example, Intel/AMD/NVIDIA drivers might mishandle exclusive fullscreen sessions, causing dropped frames or stutter.

#### 3. OS and Multi-Threading Overhead
Fullscreen mode is *supposed* to bypass desktop compositing and multitasking (like taskbar animations). ). But modern games and GPUs sometimes mismanage this. If your OS is background-processing apps (Steam VR, Discord, even GPU background apps), fullscreen’s “exclusive mode” might fail to throttle them, leading to dips. Windowed modes, while technically multitask-friendly, might hit faster frame rates because Windows’ newer optimizations prioritize the windowed window *better*.

#### 4. VSync, Present Intervals, and Frame Pacing
Gaming forums like [Linus Tech Tips](https://linustechtips.com/topic/1247796…) found that in some games, the GPU’s “present interval” (how it syncs frames with your monitor) is misconfigured in fullscreen. For example:

– Games might incorrectly cap FPS to the monitor’s refresh rate in fullscreen, even when you’ve disabled VSync.
– Windowed modes sometimes avoid this “forced capping,” letting frames flow faster when the game can’t hit VSync thresholds.

#### 5. Hardware-Specific Bottlenecks
Old or misconfigured GPUs (R9 390? iGPU?), particularly with AMD’s older drivers, have historically struggled with fullscreen modes in games like *Apex* or *Fortnite*. The GPU might toggle between High-Performance and Power-Saving states more abruptly in fullscreen due to miscommunication with the OS.

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### Solutions: Boost Your Frames, Restore Sanity

#### 1. **Toggle Windows’ Game Optimizations**
– **Go to:** Settings > System > Display > Graphics.
– **Enable:** *Optimizations for windowed games*. This flags your running game as “important” even in windowed mode, starving system background apps for its process.

#### 2. Driver Reset Therapy
– **Use Display Driver Uninstaller (DDU):** Remove your GPU driver completely, restart, and reinstall the latest driver from NVIDIA/AMD’s website, *not* Windows Update.

#### 3. Game-Specific Adjustments
– **Disable VSync/Adaptive Sync:** If your monitor uses FreeSync/GSync, test with these options off.
– **Force Present Mode:** In NVIDIA Control Panel, set *Vertical Sync* and *Power Saving Mode* to “Off” for the game.

#### 4. Test in Safe Mode
Does the issue vanish? Likely, background programs like Steam Overlay, antivirus, or even *Battle.net* are hogging GPU/CPU in fullscreen mode. Identify culprits via Task Manager or using a cleaner OS instance.

#### 5. Choose Borderless Windowed + Force Performance Mode
Use a tool like Razer Cortex or the game’s settings to force the game into “exclusive full-screen” even in windowed (borderless) mode. Avoid running true fullscreen until stability tests confirm it’s safe.

#### 6. Adjust Power Settings
Windows might throttle GPU performance in fullscreen to save power (looking at you, Intel UHD 630 hybrid GPUs). ). Set your power options to “High Performance.”

#### 7. Monitor Scaling and Resolution Mismatch
Ensure your game’s resolution *exactly matches your monitor’s native pixels*. Mismatches force scaling, which can bottleneck fullscreen rendering.

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### Why Does My Monitor’s FPS Counter Lie?

You said your monitor shows 80–240 FPS, but the game’s counter says “stable” 240? It’s physics. Monitors’ “Game Mode” or input lag compensation can show real-world *actual* frame presentation fluctuations, while in-game counters abstract vsync or buffered frames. Use a stopwatch (or FRAPS) to cross-test.

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### Closing Thoughts
The “fullscreen paradox” reflects how PC gaming’s complexity is both its strength and curse. While fullscreen *should* optimize better, drivers, OS updates, and even your graphics card’s design can flip the script.

Take the time to diagnose drivers, game settings, and OS optimizations. If all else fails, embrace borderless windowed with performance modes—it might just be the sweet spot for your rig.

**Stay sharp, stay updated, and never assume it’s your GPU’s fault.**

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**Final Tip:** If you’re a Windows 11 user, this might be your solution. Check that Optimizations for Windowed Games setting *first*. It’s like slipping NyQuil to Windows’ distractions.

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👉 **Let us know what you found!** How did you fix your fullscreen slowdown? Share below—we’re all here to learn.