Method 1 :
Start up your game,then minimize it and go to your task manager.
(Right click on taskbar and select Task Manager)
Now Go to the applications tab.
Now right click on your game and select "Go to Process".
Now just right click on the highlighted Process and select "Set Priority". Set it to "HIGH".
You will see a increase in FPS.
Method 2 :
Go to your game's Graphic settings and Set them to low. The more your graphics are lower,the more you will get FPS.
Have a Look at My FPS.