It's not the processor it's the video card. To get any better gaming performance you need a new computer. Any upgrades to the CPU will be very small due to the cooling restrains laptops are designed for, and won't help with graphic performance.
The video card in that laptop, 7000M, is ranked in the 800s out of about 900 video cards on PassMark, to play any type of newer game even on low settings you'd need a video card ranked in the low 200s, around 250 at the most.
That laptop would be great for regular use, facebook, online videos, maybe even HD videos, but not for games.