Performance problem mixing 4 RTP streams

[Fritz Emboli]

Hi,

can anybody tell me, why the following pipeline takes up to 70% CPU time on
an embedded device?

gst-launch-1.0 -v \
udpsrc port=10204 caps="application/x-rtp,clock-rate=8000,channels=1" !
queue ! rtppcmadepay ! alawdec ! \
liveadder name=mix latency=20000 ! audioconvert ! alsasink device="hw:0,0"
sync=false \
udpsrc port=10206 caps="application/x-rtp,clock-rate=8000,channels=1" !
queue ! rtppcmadepay ! alawdec ! mix. \
udpsrc port=10208 caps="application/x-rtp,clock-rate=8000,channels=1" !
queue ! rtppcmadepay ! alawdec ! mix. \
udpsrc port=10210 caps="application/x-rtp,clock-rate=8000,channels=1" !
queue ! rtppcmadepay ! alawdec ! mix.

Thanks
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