According to 'top', it's rhythmbox itself. If I try using gst-launch, it uses (I mean process 'gst-launch-0.10') around 10-20% CPU, again. So maybe it's not rhythmbox related, but gstreamer? I've just checked out svn repository of beep-media-player-2 uses gstreamer as well: it uses about the same amount CPU as rhythmbox. Totem uses 10-20% as well. I'm using ALSA directly (no ESD).
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