inside every CD deck is a little man who has a little horse. when you put the CD in the deck (via a piece of technological doohickery known in the trade as an 'ole), the little man is normally asleep so it's his wife that wakes him up. He then gets onto his little horse, which accounts for the delay of a few seconds when you insert a CD.
Depending on the horse, and the underhoof conditions, the average little man can go around the inside of a CD player at anything between six and sixty times per minute.
CDs spin faster in older, larger CD players than they do in portable discmans, because there's more headroom.