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When you render previews, Premiere Pro creates
files on your hard disk. These preview files contain the results
of any effects that Premiere Pro processed during a preview. If
you preview the same work area more than once without making any
changes, Premiere Pro instantly plays back the preview files instead
of processing the sequence again. Premiere Pro stores the preview
files in a folder you can specify. Similarly, preview files can
save time when you export the final video program by using the processed
effects already stored. Note: Adobe Media Encoder does not automatically
use Premiere Pro preview files for encoding. To use Premiere Pro
preview files, select Use Preview Files in Adobe Media Encoder.
To
further save time, Premiere Pro maintains existing preview files
whenever possible. Preview files move along with their associated
segment of a sequence as you edit your project. When a segment of
a sequence is changed, Premiere Pro automatically trims the corresponding
preview file, saving the remaining unchanged segment.
 When completely done with a project, delete preview
files to save disk space.
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