Improve performance desktop recording

[iiddnn]

How can I improve the performance of a desktop recording with integrated
webcam stream?
I tried the pipeline below, and it works, but the performance is very bad.
Records only a fraction of the frame from the webcam stream. thx

####
gst-launch-1.0  --gst-debug=3 \
videomixer name=mix \
! videoconvert \
! queue \
! videorate \
! vp8enc  min_quantizer=10 max_quantizer=10 cpu-used=2 deadline=1000000 
threads=2 \
! queue \
! mux. pulsesrc \
! queue \
! audioconvert \
! vorbisenc \
! queue \
! mux. webmmux name=mux \
! filesink location=screencast.webm ximagesrc \
! mix. v4l2src do-timestamp=true \
! video/x-raw,format=YUY2,width=640, height=480, interlaced=false,
pixel-aspect-ratio=1/1, framerate=30/1 \
! videobox border-alpha=0 top=-20 left=-25 \
! mix.
####



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