Prompt what to twist in the ini under my system for a stable game (Fallout 4)

Hi all. Play folic on the laptop:

HP Pavilion g6
CPU: Intel(R) Core(TM) i5-3210M CPU @ 2.50 Ghz 2.50 Ghz
RAM: ddr3 8GB
Graphics card:Radeon (TM) HD 7670M 2GB

The situation is the following:
Firstly, the game is not run the first time and departs from menu to the desktop.
About fps: on the street is around 22-28, sometimes sags under 18. In the premises, for example, asylum 111 fps 14-18, already angry.

Tell me what to do that'd keep at least a stable 25+ including indoors.