Below is a concise, practical guide to unlocking 60 frames per second (FPS) in Assassin's Creed IV: Black Flag on PC, covering system requirements, settings, common fixes, and troubleshooting.
Next, force V-Sync off via your GPU driver:
Before we dive into the "how," we must understand the "why." Unlike modern games that separate rendering from logic, older iterations of the Anvil engine (used in AC3 and AC4) used a double-buffer vertical sync (V-Sync) system tied to the simulation clock.
Method 2: Editing Game Files (PC only)