Locate the installation folder (usually C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher\games\Assassin's Creed IV Black Flag ).
: This setting is extremely demanding. Switching to Low or Off can reclaim 10-15 FPS in jungle environments.
: More recently, dedicated modders have released "FPS Patch" and "Graphics Tweaker" mods. These third-party tools directly raise the game's frame rate cap beyond the engine's original limits, which some players have pushed as high as 8K resolution. The Legend of the 62.5 FPS Cap
Assassin’s Creed IV: Black Flag remains a pinnacle of the AC series, offering unparalleled pirate adventures, naval combat, and exploration. However, on PC, the game is famously capped at 60 frames per second (FPS), and sometimes, poorly optimized, leading to stuttering. assassin 39-s creed black flag 60 fps unlock
Assassin's Creed IV: Black Flag Mod Focus: 60 FPS Unlock (PC) Verdict: Essential. It transforms a great game into a masterpiece.
Set your desktop refresh rate to 120Hz. Launch Black Flag in Borderless Window mode. The Windows Desktop Window Manager (DWM) sometimes forces a higher refresh rate without triggering the physics engine. This yields ~80-100 FPS with minor swimming glitches.
: Set this to Off or Low . Even modern RTX cards can experience severe "spikes" and stuttering when PhysX is set to High in this game. : More recently, dedicated modders have released "FPS
: The most common "unlock" isn't a single button, but a combination of settings. Players discovered that disabling in-game V-Sync and instead forcing it through the Nvidia Control Panel AMD Radeon software removes the 30 FPS floor, allowing for a steady 60 FPS. The .ini Trick : Technical users found they could edit the Assassins4.ini file in their Documents folder. By changing the RefreshRate DisplayableRefreshRate
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: If you are struggling to hit 60 FPS, lowering this to Normal is the single biggest performance boost besides PhysX. However, on PC, the game is famously capped
Scroll down to and change it to Fast . (Fast Sync allows your GPU to render as many frames as it wants, dropping excess frames to prevent tearing without capping performance).
Change both values from 60 to your monitor's native rate (e.g., 144 or 165 ). Save the file and close it. Method 3: Optimizing Graphics for High FPS
Set to Very High (instead of Shadows/PhysX maxed out). This gives the best visual-to-performance ratio.