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If you experience stuttering, jerky video playback on an Apple notebook, it might be because of the settings in your Energy Saver system preferences.

Open your System Preferences and click Energy Saver. In Energy Saver, click the Options tab. Now check the setting for Processor Performance. If it’s set to Reduced, change it to Highest or Automatic. Video playback may be smooth now. (I have these options in my PowerBook that has a PowerPC CPU, but I’m not sure if these options are on the newer notebooks that use Intel CPUs.)

If you’re running on battery, be sure to change the Processor Performance setting back to Automatic or Reduced when you’re done watching video. The Highest setting drains the battery the fastest. Note that on a notebook, the Energy Saver preference lets you save different settings for Battery and Power Adapter.

You might see the effect of the Reduced setting any time you perform processor-intensive tasks such as audio or video rendering, or gameplay. In those situations, you’ll want to set Processor Performance to Automatic or Highest.

If you set Processor Performance to Highest and you still see choppy performance, the cause may be another application that’s using processor cycles. Open your Activity Monitor utility, view the CPU tab, show all processes, and sort the list by %CPU to see if any applications are using an unusually high percentage of CPU cycles.

Keywords: iBook, PowerBook, MacBook, MacBook Pro, laptop