Any way to speed up my AMD Athlon P340?

[CommonerOblige]

It's a dual core 2.2ghz but it's stuttering on 1080p videos.

 

[Brett928S2]

which graphics card ?

 

[CommonerOblige]

Onboard laptop: ATI Mobility Radeon 4250.
Shouldn't the graphics card not really matter since the cpu is doing the decoding and the graphics card is probably just using the cpu?