FPS Boost? HARDWARE. You need to spend the on hardware and stop looking for some 'free software' to make your gaming experiance increase.
Otherwise drop down your graphics level first, when you hit low then look at dropping down 'screen size' to increase FPS
Got a question on how your hardware stacks up / is the RECOMMENDED hardware to make a game you want play 'like on youtube'?
Go to www.canirunit.com and they just provide EXACTLY what the MAKER says is needed / provided on the game specs.
It should be noted, besides MSI afterburner increasing your FPS by OCing, which is really a hardware improvement, the only thing software can do is take away things that might hinder your FPS, like a junked up system.