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.
: Turn Off in-game. The game's internal V-Sync often locks FPS to 30 if it drops even slightly below 60. Assassin's Creed Black Flag - How to Boost Fps,...
Because the game's engine is dated, you need to "trick" it into using your hardware correctly: To boost FPS in Assassin’s Creed IV: Black
: Set to Off . This is the single largest performance drain, even on powerful modern hardware. disabling high-impact effects like PhysX
: Set to Low or Off . The visual difference between "High" and "Low" is minimal, but the performance cost is high.