If you want to see proper stuttering of the media player, try it with a bluetooth headset! It's absolutely ridiculous, CPU usage can go up to 60% with combined pulseaudio+mediaplayer and it drops like crazy. If you add to that the fact that playing mp3's is offloaded to the DSP that gives you an idea of how many resources it takes. Using pulseaudio on such a low power device was a bad idea, and it shows, the device barely cope with it hence the stuttering.