Playback in the QuickView Tab
QuickView playback relies, in part, on the amount of memory allocated to Final Cut Pro.
Based on this allocation, Final Cut Pro caches to RAM as much of the sequence
between the In and Out points set in the Timeline as possible for accelerated playback.
If an In point is set in the Timeline but no Out point is set:
Final Cut Pro caches video from the In point through the duration specified by the
Range slider for playback in the QuickView tab.
Using RT Extreme
If neither In nor Out point is set in the Timeline:
Final Cut Pro uses the position of the playhead, caching half of the duration specified
by the Range slider before the position of the playhead, and half after the playhead, for
playback in the QuickView tab.
Video is cached to RAM as it’s played. Once the portion of the sequence that you’ve
specified for QuickView playback has played all the way through, subsequent loops
play much faster because they’re being played back directly from RAM.