: 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
For a visual walkthrough on how to further boost your frame rates and fix persistent lag in Black Flag, check out this guide: 1440x900 Thoughts: Assassin's Creed 4 – Black F...
: The game lacks native triple buffering, which causes the frame rate to tank if it drops even slightly below 60 FPS. Use D3DOverrider or the NVIDIA Control Panel to force Triple Buffering and VSync on. : Right-click the game’s executable ( AC4BFSP
Because the game natively supports 16:9, users on 16:10 monitors like yours frequently encounter letterboxing. Because the game natively supports 16:9, users on
: 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.
: 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.