Scrub High Quality
When this option is selected, video displayed in the Canvas is shown at full quality
when you scrub or when the video is stopped. If you deselect this option, the video
quality during scrubbing is determined by the current Playback Video Quality setting
Playback Video Quality
,” next). Deselecting this option allows you to improve
responsiveness during scrubbing, especially when using processor-intensive codecs
such as HDV, or options such as multiclip playback.