Hi OP,
Well, you must strongly believe that your laptop's graphics card (HD 7670M) is not sufficient to play high end games. It will definitely lag.
http://www.notebookcheck.net/AMD-Radeon-HD-7670M.69483.0.html
Look at this website for review. The card's pixel rate, texel rate, core and memory clocks and overall build are not really sufficient enough to play current games with high settings.
Instead, you can tweak it by simply changing the power saver mode to High Performance mode. Here's the tutorial on how to configure it (https://www.youtube.com/watch?v=4oB2oDO-IFk). This will eradicate at least a tad percent of stuttering and lags.
Note: Also to be noted, few games need more than 4 GB RAM. And DO NOT TRY TO OVERCLOCK LAPTOP! It is equal to dropping the laptop from the 50th floor of a building.