Help, game is laggy

[slashersaw]

Hello, new to this forum. First i would like to apologize because i'm very new to computer games. I'm more use to consoles but i had to play Amnesia since i'm huge survival horror games. So before getting the game on steam, i did that test on this website called ''canyourunthis'' or something like that. Passed the test, everything is fine. Now, i'm playing the game with my laptop plugged with an HDMI wire on my tv. Graphics looks great BUT, everytime i move, turn the camera (character), it's seems a ''little'' laggy. Again, i'm not a pro at this AT ALL and would like help at how i could fix this step by step. Would really appreciate the help since i'm totally imersed in the game and want to finish it. I read somewhere on here that i should lower my graphic card or something but i don't even know where to do that.