Right-click FarCry4.exe , go to Properties > Compatibility , and check "Run this program as an administrator" and "Disable full-screen optimizations".
Extreme Injector is a popular tool used to inject code into games and applications, allowing users to modify or extend their behavior. In the case of Far Cry 4, Extreme Injector can be used to inject a dual core fix, which enables the game to utilize multiple CPU cores. Far Cry 4 Dual Core Fix Extreme Injector Windows 10