I recently installed PulseAudio on my 2 desktops running Debian Squeeze. Since then Sip Communicator has very high CPU usage even on voice-only calls (on my core2duo it reaches ~180% sometimes, on the single-core Athlon 3200+ 85% (the rest is the pulseaudio process) and the sound stutters. The high CPU usage occurs only when the audio is routed through PulseAudio.
I have a laptop email@example.com GHz (Debian Squeeze also) that has PulseAudio installed on it a long time ago and Sip Communicator was working at ~40-50% CPU with PulseAudio with bluetooth, and with the internal sound card it was at ~20%, but recently it too has 100+ % CPU taken by the java process. So it is possible that more recent builds brought this change (and maybe the ALSA 1.0.23 upgrade of Debian Squeeze has to do with it too?).
PulseAudio 9.21, ALSA 1.0.23.
Any ideas of what might cause this?