I don't know when exactly, but for a while now everything has been fine.

The server is on Lucid (still), as are the client machines.
'uname -a' yields:
Linux blubox 2.6.32-47-generic #109-Ubuntu SMP Tue May 7 02:02:22 UTC 2013 
x86_64 GNU/Linux
pulseaudio version is 
0.9.21-63-gd3efa-dirty

I just checked it again, with a video on the client sending audio
flawlessly through both simultaneous output, and directly to the
server's sound card (with "Allow other machines on the LAN to discover
local sound devices" enabled).

I hesitate to upgrade to Precise.  But, I must.  I hope PA--and
everything else--continues as well on Precise as on Lucid.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/329896

Title:
  Pulseaudio network sinks overload CPU

Status in “alsa-lib” package in Ubuntu:
  Invalid
Status in “pulseaudio” package in Ubuntu:
  Incomplete

Bug description:
  Binary package hint: pulseaudio

  Description:    Ubuntu jaunty (development branch)
  Release:        9.04

  Trying to use network sinks with Pulseaudio causes unacceptable CPU
  load on both ends.

  To reproduce, you need 2 machines on a LAN. 
  It's most obvious if you run 'top' on both machines while doing the following:

  1) On machine 1 use paprefs to enable the following 3 options:
      Enable network access to local sound devices
      Allow other machines on the LAN to discover local sound devices
      Don't require authentication    

  2) On machine 2 use paprefs to enable the option
      Make discoverable network sound devices available locally

  Now, on machine 2, open pavucontrol. Watch the CPU usage of
  'pulseaudio' on both machines rise and rise. On one of my machines it
  maxes out the CPU and pulseaudio quits.

  Until recently I was using Ubuntu 8.10 on both these machines and
  didn't have this problem. CPU usage of pulseaudio barely registered.

  I can't see this being an ALSA issue because no audio is playing at
  the time.

  pulseaudio:
    Installed: 0.9.14-0ubuntu5
    Candidate: 0.9.14-0ubuntu5
    Version table:
   *** 0.9.14-0ubuntu5 0
          500 http://gb.archive.ubuntu.com jaunty/main Packages
          100 /var/lib/dpkg/status

  uname -a
  Linux hoss 2.6.28-7-generic #20-Ubuntu SMP Mon Feb 9 15:42:34 UTC 2009 x86_64 
GNU/Linux

  Seen on x86_64 and i386 installations.

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