Whenever your computer displays video graphics, the machine's refresh rate plays a large part in how well those graphics display. Whether you are watching a movie or playing a game, a higher refresh rate means the computer redraws the graphics more frequently. A higher refresh rate thus means smoother playback. However, higher refresh rates also require better graphics hardware. Your MacBook Pro has a variety of refresh rate settings you can change by accessing the System Preferences menu.
Click on the Apple logo at the top left-hand corner of your MacBook screen.
Click "System Preferences."
Click on the icon marked "Displays."
Click on the box next to the option labeled "Refresh Rate."
Click on one of the available refresh rates in the drop-down list that appears. Close the System Preferences window when you finish.