Symptom
When you try to record a voiceover using the audio recording feature an alert with this message appears:
"The disk responded slowly. It may have been interrupted by something, or it may not be fast enough for your movie. If you have a lot of audio clips, you might try muting the audio tracks to see if helps playback speed."
Solution
Quit other applications before recording audio in iMovie. Do not try to switch to another application while iMovie is recording audio.
Your computer may also have a fragmented hard disk. Frequent creation and deletion of files can cause disk fragmentation. This means that available disk space is not found in contiguous blocks. Although it's not a serious issue, it causes the disk to respond more slowly while you are importing media.
If you see this alert, copy the project to another disk, or consider using a disk defragmentation utility to defragment the disk where the project is located. See technical document 17933 "
Macintosh: About Defragmenting Your Computer's Hard Disk" for additional information on disk fragmentation.
Related documents
93460: "
iMovie: Using FileVault Can Affect Performance"