> Perhaps Canonical has decided to abandon support of people having older,
slower machines.
>

Try halving the sample rate with the flag '-r22050' (this halves the CPU
workload for some part of fluidsynth code)

See: 
http://sourceforge.net/apps/trac/fluidsynth/wiki/ExampleCommandLinesfluidsynth
on NetBooks and low performance computers

The only way I have found to sort out performance problems is to add
special debug code that measures how long it takes to execute all the time
critical functions/methods in mSec.

Equally well someone at Ubuntu or elsewhere could have fiddled with some
time optimised code that now eats up much CPU.
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