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Saving time by prerendering nested compositions
A complex nested composition can take a long time to preview and render. If you have a nested composition that you do not expect to work on any further, render the nested composition into a movie and use it as a proxy for the actual nested composition. As a rendered movie, it will require less calculation and will take less time to display and render in the larger project. You can still make changes to the prerendered composition, because the original nested composition remains in the project list. If you make a significant change to the original nested composition, simply render it again. Prerendering a nested composition is particularly beneficial when you use a nested composition multiple times in a project.
Using a prerendered movie in place of a nested composition also saves time and memory when you render the final version of the main composition. Just be sure to apply your final output settings when you prerender the nested composition. (See Changing render settings.)
There are three phases to prerendering a composition: Creating a composition, rendering the composition you created, and then creating a proxy from the rendered composition. Use the Pre-render command to automate the last two phases.
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