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 :-)

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Over-optimistic buffering in PulseAudio causes underruns (audible stuttering, 
pops)
https://bugs.launchpad.net/bugs/190754
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