Has not actually worked, the situation has improved - I did lots of alt tabbing with cpu hungry programs running and it was fine. The problem appears to not be high CPU usage (at least on my machine) instead when there are large changes in RAM usage there is a brief pause.
At least I don't have the crackling and distortion I got towards the end on Gusty :-)
I was wrong
sudo apt-get purge pulseaudio && sudo apt-get install pulseaudio ubuntu-desktop
Has not actually worked, the situation has improved - I did lots of alt tabbing with cpu hungry programs running and it was fine. The problem appears to not be high CPU usage (at least on my machine) instead when there are large changes in RAM usage there is a brief pause.
At least I don't have the crackling and distortion I got towards the end on Gusty :-)