: 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.
: This is the most intensive setting. Dropping it from "Very High" to "High" can provide a massive frame rate boost.
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. 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:
: 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 : Locate Assassins4
: Disable this entirely unless you have a high-end NVIDIA card, as it is a primary cause of stuttering. Fixing the 60 FPS Cap and Stutter
Because the game natively supports 16:9, users on 16:10 monitors like yours frequently encounter letterboxing. Dropping it from "Very High" to "High" can
: 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.