: Some users report that setting VSync "On" in-game, then Alt-Tabbing out and back in, forces the game to refresh its frame rate logic and smooth out performance.
Because the game natively supports 16:9, users on 16:10 monitors like yours frequently encounter letterboxing.
: Locate Assassins4.ini in your "My Documents/Assassin's Creed IV Black Flag" folder. You can manually set DisplayWidth=1440 and DisplayHeight=900 , though the game may reset this if it doesn't recognize the resolution. 1440x900 Thoughts: Assassin's Creed 4 – Black F...
For a visual walkthrough on how to further boost your frame rates and fix persistent lag in Black Flag, check out this guide:
: Set this to "High" rather than "Soft Shadows." Soft shadows are significantly more demanding (up to a 29% FPS drop) for a negligible visual difference. : Some users report that setting VSync "On"
: In your NVIDIA Control Panel or AMD Catalyst , go to "Adjust desktop size and position" and set scaling to "Fullscreen" rather than "Aspect Ratio".
Running Assassin's Creed IV: Black Flag at a resolution of (a 16:10 aspect ratio) often presents unique challenges, as the game is natively built for 16:9 displays. This can result in permanent black bars or scaling issues. Running Assassin's Creed IV: Black Flag at a
: Right-click the game’s executable ( AC4BFSP.exe ), go to Properties > Compatibility , and check "Override high DPI scaling behavior" to ensure the application handles scaling correctly. Performance Optimization Settings