EDIT : Does not work after the December 2015 patch
Since the game is not well optimised , you might experience stuttering or fps drops even on low graphic settings .
One Major solution to this problem is to use a custom Engine.ini file which lowers your Graphics even further and makes your game run better .
Here is the config file i use - http://pastebin.com/kxRRJLCj ( Clean and Working after the November 2015 update )
To apply this , go to :
C:\Users<yourcomputernamehere>\Documents\My Games\UnrealEngine3\ShooterGame\Config
Open ShooterEngine.ini , Delete the content . Copy the text from - http://pastebin.com/kxRRJLCj and Paste it .
Save the file and make it read only ( important)
i use a 4 year old office laptop , And the game runs smoothly around 150 fps after the tweeking .
If you need a video guidance , here is a video from @kAndyREW which explain things much better .
Many thanks to @LuLNope for helping me with file .
have a good day .