Because the game's engine is dated, you need to "trick" it into using your hardware correctly:
Adjusting these specific settings provides the most immediate performance gains: Assassin's Creed Black Flag - How to Boost Fps,...
: Set to Off . This is the single largest performance drain, even on powerful modern hardware. Because the game's engine is dated, you need
: Set to Low or Off . The visual difference between "High" and "Low" is minimal, but the performance cost is high. The visual difference between "High" and "Low" is
: Turn Off in-game. The game's internal V-Sync often locks FPS to 30 if it drops even slightly below 60.
To boost FPS in Assassin’s Creed IV: Black Flag , you must address its notoriously poor optimization by forcing triple buffering, disabling high-impact effects like PhysX, and managing CPU affinity.
: Switch to SMAA or FXAA . Higher settings like MSAA or TXAA are extremely demanding. Essential Technical Fixes