CPU speed has been steadily increasing while CD/DVD drive speed hasn't.  On a
recently purchased DVD drive I can rip a CD in 11 minutes and flac -8 encoding
takes about 12 seconds per track giving about 2 minutes of CPU time.  At worst
that's a 20% increase in ripping time which is worth it for saving space on the
playback device.  Ideally it would do encoding while running cdparanoia and
only increase the running time by 12 seconds.