Overclocking is not the solution. Renicing processes is more viable. Thy this:

Edit the /etc/pulse/daemon.conf
change the value of nice level to -20 (the default is -11)
save and reboot

If you experience some shuttering after several hours, this can help:
sudo gainroot
killall pulseaudio
this may helps even without renicing pulseaudio. Hope thi help you! GOD bless you ALL!