
If you Option-click (Mac OS) or Alt-click (Windows) the Reset button in the Preview panel, Cache Before Playback is enabled for Numpad-0. This option is not enabled by default for any of the preview shortcuts. However, note that frames are not displayed to the Composition, Layer, or Footage panel as they are cached. This behavior is similar to how RAM Preview behaved in past versions of After Effects. When this is enabled, After Effects caches frames before starting playback.

In After Effects CC 2015 (13.5), the Preview Favors Frame Rate mode kept the screen display cache for all cached frames, which was inefficient and could result in an unexpectedly short preview duration.Ī new Cache Before Playback option has been added.

The new caching behavior is a hybrid of the former Preview Favors Frame Rate and Preview Favors Length behaviors: The Preview Favors control has been removed. This option did not clearly express its intent of changing the caching behavior, and it received very little use.
