After simultaneously recording more than four audio tracks, the spinning disc cursor may appear for a long time when you stop recording, but before the waveforms are calculated.
Record audio to a drive that is not journaled. Note: It is not recommended that journaling be disabled on the main startup drive. Use a second drive formatted to "Mac OS Extended" rather than "Mac OS Extended (Journaled)" for audio recording.
This document will be updated as more information becomes available.