Unpredictable game is Way OFF

Why does the game seem sooo speedy? Example : the characters, the guns Rate of Fire are Way faster. z8 games is messing with something in there coding or whatever you want to call it. It's getting to the point where it even affects my mouse in game sensitivity. How can you predict or adjust to a everday change in the graphics and the speed of the game. They need to leave it ALONE. One day it takes 1 sec to empty a clip the next day it takes .05 seconds wdf? I have to adjust everday to a knew rate of fire, movements, etc..