OK, guys with music playing problem (stuttering). I can suggest you one experiment. Warning: be prepare to switch OFF-ON phone in case of some trouble, but it should not harm your files. More probable, responsiveness may slightly be harmed until reboot/switch OFF.

1. Go to X-Term, become root
2. execute

renice -20 `ps|grep "pulseaudio"|grep -v grep|cut -b1-5`
renice -20 `ps|grep "mafw-gst-renderer"|grep -v grep|cut -b1-5`

and enjoy your music while browsing.