What effect does changing the Playback Quality slider in the Properties box have?
The Playback Quality slider controls the amount of computation used to modify the material you are playing so that it runs faster or slower. When the slider is moved to the left (higher quality), more detailed computations are performed, and the resulting output quality may be perceptually higher. When the slider is moved to the right (lower quality), less detailed computations are performed, and playback is more efficient, using fewer of your computer’s resources. The Enounce Time Scale Tailor algorithms are very efficient, and typically use less than 10% of a recent computer’s resources when the Playback Quality slider is near the middle of the scale. However, keep in mind that playing streams faster–especially video streams, always puts an additional burden on your computer. See the FAQ on computer resources for more information.