It looks like this is what's filling the log (and probably consuming the CPU):
( 48.319| 0.000) I: [alsa-sink-HdmiLpeAudio] alsa-sink.c: Starting playback. ( 48.319| 0.000) D: [alsa-sink-HdmiLpeAudio] alsa-util.c: Got POLLERR from ALSA ( 48.319| 0.000) D: [alsa-sink-HdmiLpeAudio] alsa-util.c: Got POLLOUT from ALSA ( 48.319| 0.000) D: [alsa-sink-HdmiLpeAudio] alsa-util.c: PCM state is XRUN
It looks like this is what's filling the log (and probably consuming the CPU):
( 48.319| 0.000) I: [alsa-sink- HdmiLpeAudio] alsa-sink.c: Starting playback. HdmiLpeAudio] alsa-util.c: Got POLLERR from ALSA HdmiLpeAudio] alsa-util.c: Got POLLOUT from ALSA HdmiLpeAudio] alsa-util.c: PCM state is XRUN
( 48.319| 0.000) D: [alsa-sink-
( 48.319| 0.000) D: [alsa-sink-
( 48.319| 0.000) D: [alsa-sink-