“The MacBook Pro (15-inch, Late 2008) includes a new feature in the Energy Saver system preference pane for adjusting graphics performance,” Apple’s Support Doc #HT3207 explains.
You can select Better battery life or Higher performance:
• Select Better battery life for situations where heavy, graphic-intensive applications are not being used or use of the MagSafe adaptor is limited.
• Select Higher performance if playing games or carrying out other tasks which involve heavy graphics processing.
When choosing a different graphics setting in the Energy Saver system preference pane, you will be required to log out for the new settings to take effect. After choosing Log Out (shown in the message below), you will have an opportunity to save any open documents or other work.
By default, the MacBook Pro (15-inch, Late 2008) uses the Better battery life option.
Full article here.
[Attribution: Macworld UK. Thanks to MacDailyNews Reader “New MBP Owner” for the heads up.]