Apart from your CPU, RAM, HDD etc, the GPU is definitely your problem.
Try patching up the game. The latest is 1.35.
The game is very demanding. Try turning the resolution down as well instead of playing it at your native one. (i.e, if you are).
Still, if you aren't able to play the game well, play it on a desktop.
You can also play around with the texture size etc, in the User.ini file, for more FPS, but with worse eye candy.