@Felox_xo
Hey, are you sure that your system isn't too weak? Your graphics card barely meets the ''recommended requirements'' (which usually means ~60fps) and your processor is weaker than the recommended ''Intel i5 3570K'' when it comes to gaming. I also assume that your PC hardware is used for quite some years already, which lowers it's efficiency as well.
What is the average FPS you usually have when you're not in a battle and when you're not in areas like skull town (which are more demanding)?
Let's say your average FPS is around 60, it's obviously going to drop down in demanding areas, especially when there's a big squad fight going on (gunfire, moving characters, abilities, and other visual effects like exploding grenades and wraith portals)
In no way I'm trying to rob you of a solution. I'm simply giving you information.
Is your system up-to-date (windows, amd card ect.)?