Refreshing Your Media lasts for a really long time

Yeah, I’m using the same card from zip to zip to sport, and like I said, it does everything within like 2 minutes or less on the sport, but forever on the zips.  For giggles, I tried it in a clip+ and that also takes a long time.  If it’s a problem with the mp3s, any suggestions as to what to look for?  Thanks