live video latency

For an upcoming play, I'm taking a live webcam feed,
flipping it and 
adding an overlay to the image. I've got this working with
the 
following pipeline:
gst-launch "filesrc location=overlay.png ! pngdec 
! alphacolor  ! videomixer name=mix ! ffmpegcolorspace 
! videoflip method=horizontal-flip ! xvimagesink 
v4l2src! ffmpegcolorspace ! mix."

The only problem with this is that there's about a
half-second or so 
of latency between the live action and what comes out the
end of 
the pipeline. A much simpler pipeline also exhibits this.
Are there 
any obvious tricks for reducing the latency?

Thanks,
Anthony

-- 
Anthony Baxter     <anthonyinterlink.com.au>
It's never too late to have a happy childhood.

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