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Set this to Low or Off . Black Flag uses legacy Nvidia PhysX particles for smoke and explosions. Even on an RTX 40-series GPU, this setting runs on an unoptimized single-thread CPU pipeline, causing massive frame drops during intense naval battles.

Avoid TXAA or MSAA 4x/8x. Instead, use SMAA or inject FXAA through your GPU driver. Legacy multi-sampling anti-aliasing destroys performance in this specific engine.

Unlocking the frame rate in Assassin's Creed IV: Black Flag is notoriously difficult because the game engine is hard-capped at approximately

Look for a configuration file, often found in a folder named Config or directly in the game's installation directory. The file might be named something like AC4_config.ini or similar.

Keep the application running in the background while you play. Troubleshooting Common Physics Bugs

Many users report severe screen tearing even with Vsync on. Method 1: The .ini File Tweak (No Mods)

While the game is running, press Ctrl + Alt + Del to open Task Manager, then simply Alt-Tab back into the game. For many players, this odd legacy bug fix resets the internal frame limiter. 2. High-Refresh Rate Unlock (240 FPS Patch)

For NVIDIA users, a simple and effective solution is to use the driver-level FPS limiter. As noted in a community video guide, the game can run stably up to around 80 FPS, but above that, frametime consistency can become a major issue. Setting a cap of 76-81 FPS is often the sweet spot.

Keep RTSS running in the background and launch the game with in-game VSync turned off. Method 3: Editing the D3DOverrider Utility