Adobe Premiere Pro CC v.7.xx - Manual (Page 102)

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Cleaning the database and cache with the Clean button does not remove files that are associated with footage items for which the source files
are still available. To manually remove conformed files and index files, navigate to the media cache folder and delete the files.
Optimize rendering for available memory
By default, Premiere Pro renders video using the maximum number of available processors, up to 16. However, some sequences, such as those
containing high-resolution source video or still images, require large amounts of memory for the simultaneous rendering of multiple frames. These
sequences can force Premiere Pro to cancel rendering and to give a Low Memory Warning alert. In these cases, you can maximize the available
memory by changing the rendering optimization preference from Performance to Memory. Change this preference back to Performance when
rendering no longer requires memory optimization.
1. Select Edit > Preferences, and select Memory in the Preferences dialog box.
2. In the drop-down list next to Optimize Rendering For, select Memory.
3. Click OK, close Premiere Pro, and reopen the project for the new preference to take effect.
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