Game runs incredibly choppy

So my game runs extremely choppy and laggy, and I have no idea why...

My specs:

8gb ddr3

Intel(R) Core(TM) i7-3630QM CPU @ 2.40GHz 

AMD Radeon HD 7600M Series

Microsoft Windows 10

The vid card is good enough for saint's row, skyrim, any almost any other thing (I can run gta5 min details with like 30 fps on this thing). So I have no idea what the problem is.

Here are more info on my vid card:

Video Card