eague players are finding a simple Windows setting that can make a huge difference in performance. According to a discovery shared by 📖❄️ Spellbook Janna 🌪️🌨️ on Twitter, disabling fullscreen optimizations in the League of Legends executable properties can dramatically increase your FPS — especially in borderless mode.
The FPS difference
In her post, Janna noted that running League of Legends in borderless mode capped her framerate at 138 FPS, while switching to fullscreen mode pushed it to 240 FPS. However, after unchecking the “Disable fullscreen optimizations” box in the game’s compatibility settings, League reached 240 FPS in borderless mode as well.
This means you can enjoy the seamless multitasking and faster tabbing benefits of borderless windowed mode without sacrificing frame rate.
How to do it
Here’s how you can replicate the fix:
- Locate your League of Legends executable:
Go to your Riot Games folder, then open the League of Legends directory. Find theLeagueClient.exeorLeague of Legends.exefile. - Right-click the executable and select “Properties.”
- Go to the Compatibility tab.
- Check the box that says “Disable fullscreen optimizations.”
- Click Apply and then OK.
- Launch League of Legends and test your FPS in borderless mode.
This change tells Windows not to interfere with League’s fullscreen rendering, which seems to allow the game to perform closer to true fullscreen frame rates while still keeping the convenience of borderless mode.
Why this works
Fullscreen optimizations were introduced in newer versions of Windows to make switching between applications smoother, but in some games, it can cause frame rate caps or inconsistent performance. Disabling the feature lets League handle rendering directly, leading to higher, more stable FPS.
If you’ve noticed your League of Legends performance feels sluggish in borderless window mode, this quick tweak might be the solution. Several players have already confirmed that disabling fullscreen optimizations restores maximum FPS without sacrificing usability.
For more League of Legends gameplay tips, technical fixes, and performance guides, visit LoLNOW.gg
Source: 📖❄️ Spellbook Janna 🌪️🌨️
FAQ
Why does borderless mode have lower FPS
Windows applies fullscreen optimizations that can cap or throttle performance compared to fullscreen mode.
Does this work for all setups
Yes, it helps on most systems running Windows 10 or 11, though results may vary based on GPU and display settings.
Will disabling fullscreen optimizations cause problems
No, it’s safe to disable. It just removes an extra Windows layer between the game and your GPU.
Do I need to do this every patch
No, the setting will remain active until you manually change it again.
Can this help with input lag
Yes. Many players report smoother input and reduced latency in borderless mode after disabling fullscreen optimizations.
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