The time it takes to browse a directory using FileZ or Kyocera's built-in card manager (~1 minute) takes a little bit longer if my 1GB ATP 60x is filled near capacity, and it takes a while for Bebopper to build a directory of over 200 mp3 files I have loaded up.

But once that ordeal is done, operation is flawless, and there is no notable delay between songs.

Memory speed does seem to make a difference in these types operations.